2 large eggs, separated
1 tablespoon active dry yeast
2 1/2 cups all-purpose flour (keep some handy for your work surface)
3/4 cup sugar
2 tablespoons unsalted butter
peanut oil, for frying plus more for bowl
1/4 cup raspberry jam
1. In a large metal bowl, stir together warm water and yeast. Let stand until foamy; should take 5-7 minutes.
2. Add 3/4 cup flour, 1/4 cup sugar, and salt; mix until well combined. Add egg yolks and remaining 1 3/4 cups flour and 1 teaspoon Vanilla Extract. Mix until combined, then knead dough in bowl. Turn out dough onto a lightly floured work surface; knead a few minutes until smooth. Knead in margarine.
3. Transfer dough to a well-oiled bowl; turn dough several times to coat entirely with oil. Cover tightly with plastic wrap, and refrigerate overnight.
4. About 30 minutes before you’re ready to form doughnuts, remove dough from refrigerator to let come to room temperature. On a lightly floured work surface, roll out dough into an 11 inch square about 1/8 inch thick. Using a 2 inch cookie cutter (or a glass), cut out about 24 rounds, dipping cutter in flour as needed to prevent sticking. Re-roll scraps and cut out about 16 more rounds.
5. Line a baking sheet with a clean kitchen towel. In a small bowl, lightly beat egg whites. Brush edge of a dough round with egg white, then mount 1/2 teaspoon jam or chocolate bar pieces in center, or both. Top with another round and press edges to seal. Repeat process with remaining rounds. Transfer to prepared baking sheet; let doughnuts rise until puffy, 20 to 30 minutes.
6. Heat a few inches of oil in a large (4-5 quart) heavy pot until it registers 360 degrees on a deep-fry thermometer or a scrap of dough sizzles upon contact. Working in batches of 4 to 5, carefully slip doughnuts into hot oil. Fry, turning once until golden brown about 1 minute. Using a slotted spoon, transfer doughnuts to paper towels to drain.
7. Place remaining 1/2 cup sugar in a medium bowl. While doughnuts are still hot, toss them in sugar, turning to coat. Serve immediately.
Inspired by a recipe from Peace, Love and Chocolate.