Italian Grape Must Donuts - Ciambelle al Mosto

Ingredients (9)

• 3-4 tablespoons raisins
• 3 1/2 tablespoons lukewarm milk (I used 2%)(100F/40C)
• 1/4 cup + 1 teaspoon granulated sugar (divided)
• 1/2 cup grape must (either red or white) (room temperature)
• 1 teaspoon active dry yeast
• 2 1/4 cups all purpose flour
• 1 large egg yolk (room temperature)
• 1/4 cup vegetable oil (I used corn)
• 1 pinch salt