Egg Bagels

Sponge ferments ~2 hr; dough retards in the fridge overnight
1 tsp. instant yeast ferment
sponge 2 hr
knead
dough
shape, proof,
retard overnight
boil (soda water)
& bake
500°→450°F
4 cups high-gluten or bread flour
2 cups water, room temp
1/2 tsp. instant yeast
3 3/4 cups high-gluten or bread flour
8 egg yolks
2 3/4 tsp. salt
2 tsp. malt powder (or syrup/honey)
1 Tbs. baking soda, for the water
as needed cornmeal or semolina, for dusting
poppy seeds (optional)