01 - Dissolve the yeast and 1 tablespoon sugar in lukewarm milk. Let stand for 5-10 minutes until foamy and activated.
02 - In a large mixing bowl, whisk together flour, remaining sugar, salt, and lemon zest until evenly incorporated.
03 - Pour the yeast mixture, melted butter, eggs, and vanilla extract into the dry ingredients. Mix thoroughly until a soft, cohesive dough forms.
04 - Turn dough onto a lightly floured surface and knead for 8-10 minutes until smooth and elastic. Add flour 1 tablespoon at a time only if excessively sticky.
05 - Place dough in a greased bowl, cover with a clean kitchen towel, and let rise in a warm, draft-free area until doubled in volume, approximately 1-1.5 hours.
06 - Punch down risen dough and divide into three equal portions. Roll each portion into a 16-inch rope. Braid the ropes together and form into a ring or leave as a straight braid. Transfer to a parchment-lined baking sheet.
07 - Gently tuck the colored raw eggs into the braid creases, spacing them evenly around the loaf. Avoid pressing deep into the dough.
08 - Cover the loaf loosely and let rise for 30-45 minutes until puffy and slightly increased in size.
09 - Preheat oven to 350°F.
10 - Brush the entire bread surface with the egg yolk and milk mixture, taking care to avoid brushing directly on the colored eggs. Sprinkle with colored sprinkles if desired.
11 - Bake for 25 minutes until deeply golden brown and cooked through. Tent with foil if browning too quickly during the final minutes.
12 - Transfer bread to a wire rack and cool completely before slicing and serving to prevent excess moisture loss.