Prepare the Apple Fritters Pour oil into a large Dutch oven to a depth of 2 inches. Heat over medium to 360°F, reducing heat as necessary to maintain temperature.

While oil preheats, melt 1 tablespoon of the butter in a small saucepan over medium. Add chopped apples; cook, stirring occasionally, until softened but not browned, about 12 minutes. Remove from heat, and let cool slightly, about 10 minutes.

Whisk together flour, baking powder, salt, and ginger in a medium bowl; set aside. Melt remaining 1 tablespoon butter in a medium heatproof bowl. Add sugar, milk, cider, vanilla, and egg; whisk until smooth. Add flour mixture to milk mixture, and whisk until just combined. Fold in cooked apples.

Line a baking sheet with a wire rack, and set aside. Working in batches of about 4 fritters at a time, scoop about ¼ cup batter using 1 metal spoon, and slide into hot oil by pushing off with another metal spoon. Fry until golden brown on both sides, about 3 minutes total, flipping once halfway through cooking time. Remove fritters from hot oil using a slotted spoon or spider; transfer to wire rack-lined baking sheet, and let cool slightly.

While fritters cool, prepare the Cider Vinegar Glaze Stir together powdered sugar, milk, cider vinegar, vanilla extract, and ginger in a medium bowl until smooth. Drizzle over warm fritters, and serve immediately.