Preparation Steps

• In a small bowl, dissolve yeast in warm milk. Let stand until creamy, about 10 minutes.
• In a large bowl, combine the flour, sugar, and salt. Stir in the yeast mixture, butter, 3 eggs, and vanilla. Mix well until a soft dough forms.
• Knead on a floured surface until smooth and elastic, about 8 minutes. Add the raisins and lemon zest, if using, and knead until evenly distributed.
• Place dough in a greased bowl, turning once to grease the top. Cover and let rise in a warm place until doubled, about 1 hour.
• Preheat oven to 350°F (175°C). Punch down the dough and divide into three pieces. Roll each piece into a rope and braid them together. Place the braid on a greased baking sheet.
• Beat the remaining egg and brush over the loaf. Bake in preheated oven for 30-35 minutes, or until golden brown and sounds hollow when tapped on the bottom.