Prepare the apples: Peel, core, and finely chop the apples. Place them in a small saucepan with a splash of water and parboil for 2–3 minutes, until slightly softened but not mushy. Drain and cool.
Make the batter: In a mixing bowl, whisk the eggs until light. Add the milk and combine. In another bowl, whisk together flour, baking powder, sugar, and salt. Slowly fold the dry mix into the wet until a thick batter forms.
Flavor the batter: Stir in lemon zest, lemon juice, and the cooled apples. The batter should be thick, almost like pancake batter.
Heat the oil: In a heavy skillet, pour in 1 inch of oil and heat over medium-high until 350°F. Test with a small drop of batter—it should sizzle immediately.
Fry the fritters: Drop heaping spoonfuls (2–3 tablespoons each) of batter into the hot oil. Fry 2–3 minutes per side until puffed and golden. Flip once for even cooking. Drain on paper towels.
Finish and serve: While still warm, dust with powdered sugar and sprinkle with cinnamon or nutmeg. Best enjoyed hot and fresh.