Mohnkuchen vom Blech

Ingredients

Equipment Needed

• •30x40cm rimmed baking sheet
• •Poppy seed mill, spice grinder, or strong food processor
• •Small saucepan
• •Rolling pin

Instructions

1. 1

   Start the dough

   Warm the 220ml milk to blood heat, no hotter, because hot milk weakens or kills the yeast before it has lifted anything. Stir in the yeast and a spoon of the sugar, then mix with the flour, remaining sugar, egg, softened butter, and salt. Knead until smooth and elastic, 8 to 10 minutes by hand, because a worked dough stretches under the heavy poppy layer instead of tearing.

2. 2

   Let it rise

   Cover the dough and leave it somewhere warm until doubled, about 1 hour. Do not rush it into the tray while tight and cold; yeast dough needs time to loosen, or the finished base bakes dense under the filling.

3. 3

   Grind the poppy

   Grind the blue poppy seeds in a poppy mill, spice grinder, or strong food processor until cracked and darkly damp, not powdered into paste. Whole poppy stays dry and bland because the seed coat keeps the milk out; cracked poppy releases oil and drinks the filling properly.

   Buy whole blue poppy and grind it the day you bake. Pre-ground poppy turns rancid quickly because the oil is exposed, and old poppy tastes dusty before you even begin.
4. 4

   Cook the filling

   Bring the 500ml milk, sugar, butter, honey, vanilla sugar, lemon zest, rum or apple juice, and raisins if using to a gentle boil. Stir in the ground poppy and semolina, then cook over low heat for 3 to 4 minutes until thick and glossy. The semolina binds the milk, and the poppy swells before baking, so the slice sets clean instead of leaking into the dough.

5. 5

   Cool and lighten

   Take the filling off the heat and cool it until warm, not hot. Stir in the egg yolk while the filling is warm enough to move but not so hot it scrambles. Beat the egg white to soft peaks and fold it through last, because it loosens the heavy poppy without making the filling airy or weak.

6. 6

   Fill the tray

   Line a 30x40cm rimmed baking sheet. Knock back the dough, roll it to fit the tray, and push it slightly up the edges because the poppy layer needs a shallow wall. Spread the filling evenly from corner to corner; a thin patch dries out first, and a thick mound stays wet in the middle.

7. 7

   Add streusel

   Rub the streusel flour, cold butter, sugar, and salt together until you have small rough crumbs. Scatter them lightly over the poppy, not in a blanket, because the filling is the point and the crumbs are only there for a buttery bite on top.

8. 8

   Bake and cool

   Bake at 180C for 30 to 35 minutes, until the dough edge is golden and the poppy filling is set with a soft sheen. Cool completely in the tray before cutting, because hot filling smears and tears the yeast base. Cut into squares for coffee. Schön ist, was schmeckt.

Chef Tips

• •Use blue poppy seed, the standard German baking poppy. Black poppy can taste harsher, and white poppy belongs to other tables. Stay with the seed the cake was built for.
• •A poppy mill is best because it cracks the seed without heating it. A spice grinder works in short pulses; grind too long and the oil warms, then the poppy clumps before it reaches the milk.
• •Do not buy canned poppy filling for this cake. Nicht aus dem Glas. It is usually too sweet, too loose, and tastes more of syrup than seed.
• •The raisins are regional and optional. Silesian families often like them, Thuringian trays may go plainer. Leave them out if your table argues. The cake will survive.
• •Mohnkuchen keeps well because the cooked poppy filling stays moist. Cover it at room temperature for a day, then refrigerate if keeping longer.

Advance Preparation

• •Grind the poppy up to 24 hours ahead and keep it sealed in the refrigerator, because exposed poppy oil turns stale quickly.
• •The baked cake is good the next day. Cool it fully, cover it, and let the filling settle overnight; it cuts cleaner and travels well for a potluck.
• •The yeast dough can rise slowly in the refrigerator overnight. Bring it back toward room temperature before rolling, or it will shrink back in the tray.

Frequently Asked Questions

Nutrition Information

1 serving (about 180g)