Sourdough Walnut Roll Or Potica

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"RECIPE ALERT: And the baked potica (the traditional Slovenian sweet nut roll) in all its glory? If you haven't made it yet, I strongly advise you to try it. It's a real feast for your palate"
-- @sourdough_mania

Recipe Intro From sourdough_mania

Real festive treat for your palate

Ingredients

Sweet stiff starter

10g active sd starter (mine is 100% hydration)
40g flour T500 (like all-purpose)
15g water
15g sugar

Mix all ingredients into a stiff dough, cover with cling foil and leave to double.

Final dough

80g sweet starter (doubled)
450g T500 flour
Mix together:
3 egg yolks
170g milk
20g rum
80g sugar
6g salt
1 tea spoon lemon juice
1 lemon zest
Add sweet stiff starter and the flour into a mixing bowl. Knead in a machine with a dough hook, slowly add the liquid mixture. And add 70g room temp. butter when the dough is well developed. 

Walnut filling 

500g ground walnuts
50g cream (30% fat)
4 tablespoons of rum
1 egg
3 egg whites
60g sugar
50g milk (add less/more if needed, the filling should be spreadable)

Method

Mix everything together and leave covered to stand at least 4 h.

Leave the final dough in a closed container for about 3-4 h (21 C), to rise about 30%, then roll it about 0.8-1cm thick, spread the filling and roll it tightly. Put it in a buttered baking mold. Leave to double (mine took more than 18 hours, it's a heavy filling). Egg-wash (eggs, cream and pinch of salt). Bake in a preheated oven at 190 C, first 20 min covered then uncover and lower the temp to 180 C and bake until golden brown. Mine took about 1 hour.