In glass measuring bowl, whisk together water, milk, yeast and sugar.
Let sit for 10 minutes or until bubbling.
While waiting, in a separate bowl, whisk one egg.
In the bowl of the stand mixer, combine flour and salt.
Using your fingers, mix the butter into the flour mixture, making crumbs.
With paddle attachment and mixer on low, add yeast mixture and whisked egg to the flour.
Mix just until combined.
Switch to the hook attachment.
Mix on low for 4 minutes.
Increase speed to medium and mix for 4 more minutes.
Remove bowl with dough from stand mixer.
Form into a ball shape and cover bowl with plastic wrap and a dish towel.
Place bowl in a warm place and let rest/rise for 2 hours.
Prepare baking sheet with parchment paper.
After dough has risen, divide into 8 equal pieces and place on prepared sheet. **Dough will be VERY sticky.
Roll each part into a ball, return to prepared sheet 2-3" apart.
Cover loosely with a clean dish towel. Let rise in a warm place for another 2 hours.
Optional: Place a shallow pan of water on bottom of oven (this will produce more humidity in oven).
Preheat oven to 400F with a rack in the center.
Whisk together remaining egg with 1 tsp of water.
Before placing rolls in oven, brush with egg mixture.
**Optional: sprinkle with toppings at this point if you choose to.
Bake in preheated oven for 15 minutes, until golden brown, turning halfway through.
Transfer to cooling rack to cool completely.