Toss diced Granny Smith and Honeycrisp apples with a squeeze of lemon juice and the lemon zest. Set aside.
In a large bowl, mix together the flour, sugar, baking powder, pumpkin pie spice, and salt.?In another bowl, whisk the eggs, buttermilk, melted butter, and vanilla extract.?Combine the wet and dry ingredients just until incorporated, then gently fold in the apples.
Heat 2 inches of oil in a heavy-bottomed ( I used my Dutch pot) pot to 350°F (175°C).
Drop heaping spoonfuls of batter into the oil and fry 2–3 minutes per side, until deep golden brown.?Remove to a paper-towel–lined tray.
Whisk together all glaze ingredients until smooth. Dip the warm fritters or drizzle the glaze over them.
Enjoy warm, dusted with extra lemon zest if desired.