01 - Dissolve yeast and 1 tablespoon sugar in lukewarm milk. Let stand 5-10 minutes until foamy and activated.
02 - In a large mixing bowl, whisk together flour, remaining sugar, salt, and lemon zest if using.
03 - Pour yeast mixture, melted butter, eggs, and vanilla into dry ingredients. Mix until soft dough forms.
04 - Knead dough on lightly floured surface for 8-10 minutes until smooth and elastic. Add flour 1 tablespoon at a time if sticky.
05 - Place dough in greased bowl, cover, and let rise in warm area until doubled, approximately 1-1.5 hours.
06 - Punch down risen dough. Divide into three equal portions and roll each into 16-inch ropes.
07 - Braid ropes together and form into ring or leave straight. Transfer to parchment-lined baking sheet.
08 - Gently tuck raw colored eggs into braid, spacing evenly. Press only lightly into dough.
09 - Cover loosely and let rise 30-45 minutes until puffy and expanded.
10 - Heat oven to 350°F.
11 - Brush bread surface with egg yolk mixture, avoiding colored eggs. Add sprinkles if desired.
12 - Bake for 25 minutes until golden brown and cooked through. Tent with foil if browning too quickly.
13 - Transfer to wire rack and cool completely before slicing and serving.