Ricotta Tortellini

Preparation

1. Filling

   Step 1

   Mash all ingredients in a medium bowl until well blended and smooth. Cover and chill while preparing dough.

2. Dough

   Step 2

   Place first 3 ingredients in bowl of a stand mixer with a dough hook. Mix at low speed until dough pulls away from side of bowl, about 4 minutes. Place on work surface; knead until smooth, adding water by teaspoonfuls if dry, 2-3 minutes (dough is fairly stiff). Divide in 4, flatten, wrap in plastic, and chill for 30 minutes.

   Step 3

   Working with 1 dough round at a time, run dough through widest setting of a pasta machine. Fold in half; run through machine. Repeat 7 times. Roll through machine without folding, decreasing width setting after each roll, until 1/16" thick. Transfer to a floured surface.

   Step 4

   Using a 3" cookie cutter, cut dough into circles. Spoon 1 rounded teaspoonful of filling into center of each dough. Brush edges lightly with egg white; fold over and press to seal, forming a half-moon shape. Fold and press tips together, moistening with egg white to seal. Transfer to a lightly floured rimmed baking sheet.

   Step 5

   Bring a large pot of water to a boil. Season with salt; add tortelloni. Simmer, stirring gently, until cooked through, 2-3 minutes after they begin to float. Using a slotted spoon, divide tortelloni among bowls. Drizzle melted butter over and serve with cheese.

   Do ahead: Tortelloni can be made 6 hours ahead. Cover and chill.