In a small bowl, combine the yeast with a little lukewarm milk and a teaspoon of sugar. Let it stand for 5-10 minutes, until foamy.
In a large mixing bowl, sift together the flour, sugar, salt, lemon zest, and vanilla extract.
Make a well in the center of the flour mixture, and pour in the yeast mixture, eggs, and the remaining lukewarm milk. Mix with a wooden spoon.
Add the melted butter and knead the dough for 5-10 minutes, until smooth. If you want to add apple, add the finely diced apple now.
Cover the dough and let it rise in a warm place for 1 hour, or until doubled in size.
In a deep saucepan or fryer, heat the oil to 340-355°F (170-180°C). The oil is ready when a small piece of dough slowly browns in it.
Using a spoon or ice cream scoop, form small balls of dough and carefully drop them into the hot oil.
Fry the smoutebollen until golden brown, about 3-4 minutes, turning them occasionally to ensure even browning.
Remove the fried doughnuts and place them on paper towels to drain any excess oil.
While still warm, dust generously with powdered sugar and serve fresh. Best enjoyed immediately!
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