- For basil mayonnaise, blend basil, lemon juice, and mayonnaise in food processor. Season to taste and set aside.
- Whisk eggs and add melted butter and buttermilk. Stir in dry ingredients. Stir scallions and cheese together and add to mixture. Let rest in refrigerator for 30 minutes.
- Heat 2 to 4 inches of oil in a deep skillet until a deep-fry thermometer reads 350 degrees. Drop batter by rounded tablespoonfuls in hot oil and fry until golden brown. Cook in small batches to maintain oil temperature. Drain briefly on paper towels. Serve hot with basil mayonnaise.