Sourdough Onion Rye: Deli-Style Bread at Home

Short answer: combine 60% bread flour, 40% rye, 60g caramelized onions, and a touch of caraway. Bake in a tin for sliceable deli-style rye bread.

What makes this rye special

Most home rye breads:

• Are 100% rye (too dense, hard to handle)
• Have no inclusions
• Lack the deli character

This recipe:

• 40% rye for flavor without too much density
• Caramelized onions for sweetness and texture
• Caraway for the classic rye flavor
• Pan baked for clean slices

The result tastes like deli rye, sliced thin and ready for sandwiches.

The recipe

For one 9x5 loaf:

• 300g bread flour
• 200g medium rye flour
• 350g water (70%)
• 100g active starter (rye starter is ideal)
• 10g salt
• 1 tbsp caraway seeds (toasted briefly, optional)
• 60g caramelized onions, cooled
• 15g molasses (for color and flavor)

Caramelizing the onions

Slice 1 large onion thin. Cook in 1 tbsp butter over low heat for 30 minutes, stirring occasionally. Cool fully.

(Make a big batch and freeze; they keep forever.)

Method

Mix

Combine all liquids (water, starter, molasses). Add flours, caraway, salt. Mix shaggy.

Add cooled onions, distributing evenly.

Bulk

Bulk 4–5h at 75°F.

Rye dough is sticky and harder to fold. Use 3 sets of folds (rye doesn't develop gluten as much; over-folding can cause it to break down).

Shape

Tip onto a lightly floured (or rye-floured) surface. Shape into a log: pat into rectangle, roll up tightly.

Place seam-down in a greased loaf pan.

Final proof

1.5–2 hours at 75°F until dough rises just above pan rim.

Bake

Preheat to 400°F.

Brush top with water. Sprinkle additional caraway seeds.

Bake 35–40 minutes, until internal temp 205°F.

Cool fully on rack (rye benefits from a long cool — at least 2 hours).

Why a long cool matters

Rye breads continue to set after baking. If you cut early:

• Gummy crumb
• Wet center
• Disappointing texture

Wait at least 2 hours. Better: bake the day before serving.

Variations

Pumpernickel-style

Replace medium rye with dark rye. Add 1 tbsp cocoa powder + 1 tbsp coffee for the dark color.

Marbled rye

Make two doughs: one plain, one with cocoa + molasses. Layer in pan for marbled effect.

No onion rye

Skip the caramelized onion. Add 2 tbsp toasted caraway. Plain rye for sandwich versatility.

Seedy rye

Add 50g sunflower seeds + 30g pumpkin seeds + 20g flaxseeds.

Cumin rye

Replace caraway with toasted cumin seeds. Different but excellent.

What to make with onion rye

The classic uses:

• Reuben sandwich: corned beef, sauerkraut, Swiss, Russian dressing
• Pastrami on rye: pastrami, mustard, pickle
• Liverwurst sandwich: liverwurst, onion, mustard
• Open-faced: cream cheese + smoked salmon + capers

For each, the onion rye is the foundation. The bread is the star.

A Reuben to remember

Slice onion rye 1/2 inch thick. Toast lightly. Build:

• 4 oz corned beef
• 1/4 cup sauerkraut, drained
• 2 slices Swiss cheese
• Russian or Thousand Island dressing

Grill in butter 4 minutes per side until cheese melts.

The onion rye amplifies the meat and cheese.

A weeknight pastrami

Slice rye thin. Spread mustard. Pile pastrami high. Add a pickle.

Done in 5 minutes; tastes like a deli.

Storage

Onion rye keeps:

• Counter, cloth bag: 4 days (rye keeps longer than wheat)
• Refrigerated: 1 week (acceptable; some loss of texture)
• Sliced and frozen: 2 months

Toast slices straight from the freezer. They thaw quickly.

Why molasses

A small amount of molasses:

• Adds dark color
• Brings sweetness
• Complements the rye flavor
• Authentic deli flavor

Don't skip it. The flavor is noticeably different without.

A deli copy

To match deli rye:

• Use rye sour starter (rye-fed for several feeds)
• Add 1 tsp dough conditioner (commercial bakeries use it; home bakers usually skip)
• Slice thin (3–4mm)

Most home bakers can't replicate exact deli rye, but the onion version comes close enough that it's its own thing.

Caraway vs. without

Caraway is divisive:

• Some love it (true rye flavor)
• Some hate it (too aniseedy)

If you're unsure:

• First bake: half the caraway (1.5 tsp)
• Adjust next time

For a no-caraway rye, omit entirely. Still excellent — just different.

A morning bake

If you want fresh onion rye for lunch:

• 6 PM the night before: feed starter
• 6 AM: starter is at peak, mix dough
• 6 AM–11 AM: bulk
• 11 AM: shape
• 1 PM: bake
• 3 PM: cool
• Lunch ready by 3 PM

Or just bake the day before. The flavor is better on day 2 anyway.

Why home rye beats grocery rye

Grocery rye:

• Often 90% wheat with rye flavoring
• Soft and squishy (made for shelf life)
• Lacks real fermentation depth

Home onion rye:

• 40% real rye
• Properly leavened
• Real caramelized onion flavor
• Texture for sandwiches

The difference is dramatic. You'll spoil your sandwich preferences.

A note on rye difficulty

Rye is harder to work with than bread flour:

• Sticky
• Doesn't develop gluten
• Easy to over-mix

This recipe at 40% rye is the easy entry point. As you gain confidence, you can push to 60% or higher.

But 40% is the sweet spot for deli-style sandwich rye. Start here.