Limppu

Limppu (Finnish Rye Bread)

A traditional Finnish mixed-flour rye loaf with a dense, tender crumb, glossy crust, and mildly sweet, malty flavor. The dough rests overnight in the fridge for a slow, even rise, then bakes the next morning in a tall narrow pan.

Prep

30 min

Cook

55 min

Total

85 min

Serves

1 loaf (about 12 slices)

Difficulty

Medium

Recipe ingredients

• •300 g (10½ oz) rye flour, medium or dark rye, Finnish-style if available
• •200 g (7 oz) wheat flour, bread or strong bread flour
• •350 ml (1½ cups) buttermilk or piimä, sour milk; do not substitute sweet milk
• •150 ml (⅔ cup) lukewarm water, around 35 °C / 95 °F
• •60 ml (¼ cup) Finnish dark syrup or molasses, divided: 40 ml in dough, 20 ml for brushing
• •100 g (3½ oz) cooked mashed potato or cooked oat porridge, optional but traditional; holds moisture
• •10 g (2 tsp) salt
• •10 g (1 tbsp + 1 tsp) caraway seeds, lightly crushed
• •15 g (½ oz) fresh yeast, or 7 g / 1 sachet active dry yeast
• •5 g (1 tsp) softened butter or oil, for greasing the pan

Steps

1. 1 Grease a tall, narrow loaf pan (about 22 × 10 × 9 cm / 9 × 4 × 3½ in) thoroughly with butter or oil. Rye dough sticks easily, so do not skip this.
2. 2 In a large bowl, whisk the buttermilk, lukewarm water, and 40 ml of the dark syrup. Crumble in the fresh yeast (or sprinkle active dry yeast on top) and stir until dissolved. Stir in the mashed potato or porridge if using.
3. 3 Add rye flour, wheat flour, salt, and caraway seeds. Mix with a wooden spoon or dough scraper until you have a very soft, sticky, uniform dough. Do not knead — rye does not develop gluten the way wheat does, and overworking makes the loaf heavy. The consistency should be like thick porridge; if it is stiffer than that, add water 1 tablespoon at a time.
4. 4 Spoon the dough into the prepared pan, smooth the top with a wet hand or spatula, and cover with plastic wrap or a damp towel.
5. 5 Refrigerate the dough for 8 to 12 hours (overnight is ideal). The cold rise is traditional and gives limpa its characteristic even crumb and mild tang.
6. 6 In the morning, remove the pan from the fridge and let it sit at room temperature for 45 to 60 minutes, until the dough has risen just to or slightly above the rim of the pan. Meanwhile, place a rack in the lower third of the oven and preheat to 180 °C / 350 °F.
7. 7 Brush the top of the loaf with the remaining 20 ml of dark syrup for the classic glossy Finnish crust.
8. 8 Bake on the lower rack at 180 °C / 350 °F for 50 to 60 minutes. The bread is done when the internal temperature reads 96 to 98 °C / 205 to 208 °F on an instant-read thermometer, the top is deep brown and glossy, and the bottom sounds hollow when tapped. If the crust darkens too quickly, tent loosely with foil for the last 15 minutes.
9. 9 Turn the loaf out of the pan immediately and cool on a wire rack for at least 2 hours before slicing. Limppu cuts best when fully cool; warm rye crumb tears.
10. 10 Store wrapped in a clean linen or cotton towel, then in a paper bag — never plastic while warm, or the crust turns gummy. Keeps 4 to 5 days at room temperature; slices freeze well for several months.