03Transfer leeks to a large bowl and add scallions. In another bowl, whisk together flour, 1 teaspoon salt, baking powder, a few grinds of black pepper and cayenne. Add to leeks and stir. Add egg and stir.04Heat oven to 200 degrees. In a large heavy skillet, heat 2 tablespoons oil over medium heat until shimmering. Drop heaping tablespoons of leek mixture into skillet and lightly flatten with the back of a spatula. Cook until golden brown, about 3 minutes; if cooking too quickly, lower the heat. Flip fritters and cook until golden on the other side, another 3 minutes. Drain on paper towels and transfer to oven.05Repeat with remaining leek mixture, adding oil and adjusting heat as needed.06When fritters are cooked, make cream: whisk all ingredients together and season to taste with salt. Serve warm fritters in stacks, with a dollop of cream on top.