- 1 3/4 cups all-purpose flour
- 3/4 cup sugar, plus 1 teaspoon for sprinkling
- 2 teaspoons baking powder
- 1/4 teaspoon baking soda
- 1/4 teaspoon salt
- 1 egg, lightly beaten
- 3/4 cup buttermilk
- 1/4 cup fresh lemon juice
- 1/2 cup (1 stick) unsalted butter, melted
- 1 tablespoon poppy seeds
- 1 teaspoon lemon zest
- Raspberry Butter 
Preheat oven to 350 degrees F. Lightly grease a standard 12-well muffin pan or a jumbo 6-well muffin pan.
Sift together the flour, sugar, baking powder, baking soda, and salt into a large mixing bowl. In a separate bowl, whisk together the egg, buttermilk, and lemon juice.
Make a well in center of the flour mixture and pour the buttermilk mixture into the well. Add the melted butter and use a rubber spatula to blend with quick strokes, being careful not overmix the batter; it should still be slightly lumpy. Gently stir in the poppy seeds and lemon zest.
Spoon batter into the prepared muffin pan, filling each well 3/4 full. Bake until slightly puffed and golden, 20 to 22 minutes. Cooking time may be a little longer if you are baking jumbo-sized muffins. Lightly sprinkle sugar over the tops of the muffins, if desired. Remove the muffins from the pan and cool slightly on a wire rack. Serve the muffins warm, with Raspberry Butter.