In a large bowl, mix together the ricotta, flour, sugar and vanilla. Let the mixture stand for about 15 minutes.
Meanwhile, heat about 3 1/2 cups of oil depending on the size of your pan.
You will need enough oil to cover the zeppole completely while frying. You can tell when oil is ready by dropping a tiny piece of the batter into the oil.
When the piece of batter starts to rapidly sizzle, the oil is hot enough.
Drop the zeppole by scant teaspoonfuls into the oil by using your finger to push the batter off the spoon.
Cook until deep golden brown.
Gently turn with a fork to cook both sides.
Remove with a slotted spoon to a large plate lined with paper towels and allow to cool.
Dust with sifted powdered sugar when cool.
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