2 7-gram packages active dry yeast
1/2 cup milk
1 3/4 cups plus 2/3 cup flour
1 cup sugar
1/2 tbsp. plus a pinch of salt
1 tsp. each finely grated orange zest and lemon zest
1 tsp. vanilla extract
7 egg yolks plus 1 egg white and 1 egg
15 1/2 tbsp. butter (11 1/2 tbsp. melted, 4 tbsp. chilled
3 oz. almond paste (about 1/3 cup), broken into pieces
2 cups sponge cake crumbs
1 tsp. cinnamon
3/4 cup seedless raisins, plumped in boiling water and
1 1/2 tbsp. dark rum
1/2 lb. chocolate (preferably 55–72 percent cocoa),
melted and kept warm
1. Whisk together yeast and milk in the bowl of a standing mixer until dissolved. Add 3/4 cup flour and beat on slow speed with paddle attachment; increase speed to medium-high and beat for 3 minutes. Cover with plastic wrap and let rise in a very warm spot until doubled in volume, about 1 hour. Add 1 1/3 cups flour, 1/2 cup sugar, 1/2 tbsp. salt, zests, 1/2 tsp. vanilla, and yolks to dough. Beat on slow speed to combine; increase speed to medium and mix until dough pulls away from paddle, then increase to high and beat for 2 minutes. Reduce to low and drizzle in 8 tbsp. melted butter in 3 batches, waiting between additions until it's absorbed; beat until combined. Increase to high; beat for 3 minutes more. Cover bowl and let rise in a very warm spot until doubled in volume, about 2 hours. Punch down dough with floured hands; turn out onto a parchment paper–lined sheet pan dusted with flour; dust top of dough with flour. Slip pan into a garbage bag and tie tightly; chill overnight.
2. Beat almond paste and egg white in a bowl with an electric mixer until combined. Add crumbs, 1/2 tbsp. melted butter, and 1/4 cup water; beat until combined. Cover and set filling aside. Stir together remaining flour, 1/4 cup sugar, and 1/2 tsp. cinnamon in a bowl. Add diced butter and remaining vanilla; beat just until crumbly. Cover and chill streusel. Grease two 2 1/4" × 4" × 8" loaf pans with a little of the remaining melted butter. Combine raisins and rum in a bowl; then combine remaining sugar and cinnamon in another bowl. Whisk together remaining salt, 1 egg, and 2 tsp. water in a bowl to make an egg wash.
3. Halve chilled dough. On a floured surface, roll out each dough piece to a 6" × 14" rectangle (long sides parallel to you). Brush with egg wash; divide and spread half of the filling over each, leaving a 1" margin around edges. Spread 1/4 cup chocolate over each (reserve remaining chocolate); sprinkle with the raisin mixture and cinnamon–sugar mixture. Press raisins and filling into dough. Roll each dough half into a tight jelly roll; press to seal bottom and sides. Gently roll each jelly roll into a 20"-long piece. Fold each in half lengthwise and twist each twice. Place each twisted roll in a prepared pan, seam side down and ends tucked under. Brush tops and sides with the remaining melted butter; sprinkle with two-thirds of the streusel (reserve remaining streusel), gently pressing it in. Let rise in a very warm spot until doubled in volume, about 2 hours.
4. Heat oven to 350°. Sprinkle loaves with remaining streusel and bake until golden brown and cooked through, about 45 minutes. Let cool. Drizzle with remaining chocolate and let set.
MAKES TWO 8" LOAVES