Gerbeaud Cakes

Filling

• 8 oz walnuts, whole
  或 8 oz hazelnuts, without skin
• 8 oz sugar
• 1 lemon, zest only, no white pith
• 2 oz dark raisins

Dough

• 2 oz whole milk
• 1 tsp active dry yeast
• 8 oz unsalted butter, diced, room temperature
• 2 ½ oz sour cream
• 1 ½ oz sugar
• 1 egg yolk, from large egg
• 17 ½ oz all-purpose flour
• 1 tsp baking powder
• ¼ tsp salt
• 6 oz apricot jam, divided
• 5 oz dark chocolate chips
• 2 oz unsalted butter, diced