The Best Sourdough Sandwich Bread (Soft, UK Tin Loaf Recipe)

Most sourdough recipes online produce free-form rustic loaves — beautiful, crackly-crusted, but utterly impractical for sandwiches. The slices are uneven, the crust is too tough for kids' lunchboxes, and the holes leak out the filling. What you actually want for everyday eating is a square, soft, tin-baked sourdough sandwich loaf. This recipe produces exactly that — proper sourdough flavour, soft and even crumb, slices that hold mayonnaise and pickle without falling apart, and a gentle crust your seven-year-old won't reject.

The recipe

Ingredient	Weight	Baker's %
Strong white bread flour	500g	100%
Whole milk (or 50/50 milk and water)	320g	64%
Active sourdough starter	100g	20%
Salted butter, softened	40g	8%
Honey or caster sugar	20g	4%
Fine sea salt	10g	2%

Equipment: a 1kg loaf tin (around 24cm × 12cm × 8cm). Yields one sliceable loaf.

Why this recipe works for sandwiches

Three things distinguish a great sandwich loaf from a country loaf:

1. The fat content. Butter and milk produce a softer, more enriched crumb that doesn't tear under fillings.
2. The hydration. 64% — lower than country bread — gives a tighter, more uniform crumb without big holes.
3. The tin. Baked in a tin with the lid eventually off, you get a flat-topped square loaf that slices into proper sandwich shapes.

The result is closer to a posh shop-bought white loaf than to a rustic boule, but with the depth of flavour and digestibility of true sourdough.

Method

Day 1, 8am — Build the levain

Take 20g of your active starter, feed with 40g flour and 40g milk. Let it double — usually 4–5 hours.

Day 1, 1pm — Mix the dough

Warm the milk slightly so it's at body temperature (around 30°C — feels just-warm to the touch). Whisk in the honey and starter until dissolved. Add the flour, mix to a shaggy dough. Cover and rest 30 minutes (this is a quick autolyse).

After the rest, add the salt and softened butter. Mix in by squeezing and pinching through the dough — the butter will resist incorporation at first, then suddenly disappear. Knead in the bowl for 5 minutes until smooth.

Day 1, 1:45pm–6pm — Bulk fermentation

Cover and bulk at room temperature. Three sets of stretch-and-folds, 30 minutes apart, for the first 90 minutes. Then leave undisturbed.

The dough is enriched (with butter and milk) so it ferments slightly faster than a plain country dough. Bulk for 4–4.5 hours total, until the dough has grown by around 60% and feels light and airy.

Day 1, 6pm — Shape and tin

Lightly grease your loaf tin with butter or oil. Tip the dough onto a counter. Pat into a rough rectangle, fold the long sides into the middle, then roll into a tight log from one short end. Pinch the seam closed and place seam-down in the tin.

The dough should fill about two-thirds of the tin. If you've used a tin that's too big, the loaf won't get a proper rise to the top during proof.

Day 1, 6pm — Cold retard

Cover the tin loosely with a shower cap or plastic bag. Into the fridge for 10–14 hours.

Day 2, 7am — Final proof

Take the tin out of the fridge. Leave at warm room temperature for 60–90 minutes. The dough should rise to roughly 1cm above the rim of the tin.

Don't skip this warm-up — putting cold dough straight into the oven gives you a dense base and a poorly risen top.

Day 2, 8am — Bake

Preheat the oven to 220°C with a baking stone or empty roasting tin on the lower rack.

Just before the loaf goes in, brush the top with milk and (optionally) sprinkle with a few oats or sesame seeds. Slash a single shallow cut along the top with a sharp knife.

If your oven has a baking stone, slide it onto the bottom shelf and pour 100ml of boiling water into the empty roasting tin to create steam. (Alternatively: just bake in a normal preheated oven without steam — slightly less dramatic crust but still excellent.)

Bake at 220°C for 15 minutes, then drop to 200°C and bake for another 25 minutes. The loaf should sound hollow when tapped on the bottom; the internal temperature should hit 96°C.

Tip out of the tin and cool on a rack for 60 minutes before slicing.

What a perfect sandwich loaf looks like

• Crust: golden brown, soft enough to bite through easily but not pale.
• Shape: square or slightly domed, fills the tin completely without bulging out the sides.
• Crumb: tight, even, soft. Holes are small and consistent, like a posh white sliced.
• Texture: tender, springs back when pressed, slices cleanly without crumbling.
• Flavour: mild sourdough tang with a creamy buttery undertone, slight sweetness from the honey.

The 100% milk version

For a richer, more brioche-like loaf, replace the water portion with all milk. The crumb gets even softer; the crust gets darker and more caramelised; the flavour gets more pronounced. Best for breakfast bread or French toast — slightly too rich for everyday lunchbox sandwiches.

The 50/50 wholemeal version

Replace 250g of the strong white with strong wholemeal. Increase milk to 340g. Add an extra 30 minutes to bulk. The result is a wholemeal sandwich loaf with proper sandwich-loaf softness — much better than commercial wholemeal sliced.

Storing sandwich bread

Sandwich bread keeps differently to country loaves. The fat content keeps it soft for longer.

• In a bread bin or paper bag: 4–5 days, soft throughout.
• Sliced and frozen: 3 months. Toast straight from frozen — it works perfectly.
• Don't refrigerate: the fridge stales sandwich bread fast.

The most useful trick: slice the whole loaf as soon as it's fully cooled, freeze the slices flat between layers of baking paper, and you have an instant supply of sandwich slices that toast or eat straight from frozen.

Common problems

Loaf is dense and heavy: almost always under-proofed. The loaf needs to rise above the tin rim before it goes in the oven. Wait longer next time.

Top crust is leathery: overproofed (skin formed during proof) or oven not hot enough. Cover with cling film during proof to prevent skinning.

Loaf collapses in the middle: overproofed. The dough exhausted before it hit the oven. Reduce final proof time.

Pale crust: not enough heat or no steam. Increase preheat to 230°C and add a steam pan.

Crumb has big holes: shaped too loosely, or didn't degas before tinning. Roll tighter when forming the log.

The lunchbox repertoire

This loaf is the foundation of every classic British sandwich. A few favourites:

• Cheddar and pickle, no butter (let the bread speak).
• Coronation chicken — properly made, mayo + curry powder + sultanas.
• Egg mayo with watercress.
• Cheese and tomato (toast the bread first or it goes soggy).
• Ham, mustard, butter, lettuce — the platonic ham sandwich.
• BLT with proper streaky bacon and aioli.
• Tuna mayo with sweetcorn and finely diced shallot.
• Cucumber and cream cheese with dill — the surprise office hit.

FAQ

Why use milk instead of water?

Milk produces a softer, more tender crumb and a sweeter, more golden crust. For sandwich bread these are all desirable.

Can I make this without honey or sugar?

You can but the flavour is flatter. The sugar feeds the yeast and contributes to browning. 20g per 500g flour is barely sweet — won't taste sweet in the finished loaf.

What size tin do I need?

1kg loaf tin (24cm × 12cm × 8cm). A 2lb tin in old British measurements. Smaller tins make smaller loaves; larger tins underfill.

Can I make this without a tin?

Not really — the tin is what gives sandwich bread its shape. Without it you get a free-form loaf that won't slice into squares.

Why does the crust go soft after baking?

Because of the milk and butter. A sandwich loaf is supposed to have a soft crust — you can press it for a soft toastie. If you want a crisp crust, this isn't the right recipe.

Can I do a same-day version?

Yes — skip the cold retard and proof in the tin at room temperature for 90 minutes after shaping. The flavour is less developed but the texture is similar.

Why is my loaf domed instead of flat-topped?

That's normal for an open-tin bake. For a perfectly flat top (like Pullman bread), use a Pullman tin with a sliding lid, baked with the lid closed.

The case for owning a loaf tin

If you've been baking sourdough free-form for a while, a loaf tin opens an entirely new dimension of practical bread. Country loaves are weekend bread; sandwich loaves are weekday bread. They live in different rotations and serve different purposes. £8 for a decent loaf tin and you have everything you need to bake the bread your lunches actually want.

The Sunday sandwich-bread routine

Mix Saturday afternoon. Bulk Saturday evening. Shape into the tin Saturday before bed. Bake first thing Sunday morning. The kitchen smells extraordinary; the loaf is on the cooling rack by 9am Sunday; you have sandwich bread for the week. Total active time: under an hour. The most rewarding kind of baking — modest input, week-long output.

Why this loaf beats supermarket sliced

The maths is straightforward. A tin of decent shop-bought "sourdough-style" sliced bread costs around £2.50–£3 and gives you 14–16 slices. This homemade loaf costs about 75p in ingredients and gives you 18–20 slightly thicker slices, with substantially better flavour, no preservatives, and no commercial yeast. Two loaves a month saves you around £4 and produces meaningfully better lunches across that month.

The bigger argument is qualitative. Supermarket sandwich loaves are engineered for shelf life — they contain enzymes, emulsifiers, and stabilisers that delay staling. Your home loaf doesn't have any of that. It tastes like bread, not like a sandwich substrate. The difference, after a week of using it, becomes hard to unnotice.

The freeze-and-toast workflow

Most home bakers who switch to homemade sandwich bread end up at the same workflow: bake one loaf on Sunday, slice it fully on Sunday afternoon, freeze the slices flat with parchment between every two or three. During the week, pull out two slices at breakfast and toast them straight from frozen — they toast in 90 seconds and there's no quality loss. Lunchbox sandwiches: same thing, defrost overnight in the lunchbox.

This approach gives you fresh-tasting bread every day from a single Sunday bake. Weeks of better lunches for an hour of weekend work.

One last refinement: the milk wash

Just before baking, brush the top of the loaf with a thin coat of cold milk. The milk caramelises in the oven, giving you a deeply golden, slightly glossy crust that looks like it came from a good bakery. Five seconds of work for a noticeably better look.