Lemon Ricotta Fritters with Fresh Berry Jam

Name: Lemon Ricotta Fritters with Fresh Berry Jam
Ingredients: 4 to 6 cups vegetable oil; 3/4 cup all-purpose flour; 2 teaspoons baking powder; 1 teaspoon grated lemon zest; 1/4 teaspoon salt; 1 cup whole milk ricotta; 2 large eggs, lightly beaten; 3 tablespoons granulated sugar; 1 1/2 teaspoons pure vanilla extract; Confectioners' sugar, for dusting; Lemon zest, for garnish; Quick Berry Jam, for accompaniment, recipe follows; 1 pound fresh strawberries, tops cut off and halved; 1/2 pint blackberries; 1/2 pint raspberries; 1/2 to 3/4 cup sugar, depending on sweetness; 1 tablespoon fresh lemon juice