Preheat oven to 425°F (220°C). Line or grease 12 standard muffin cups.
Stir together the flour, sugar, brown sugar, baking powder, baking soda, salt, and lemon zest in a large bowl. Make a well in the center of the mixture.
In a separate bowl, stir together the butter, milk, eggs, and lemon juice. Pour into the well in the flour mixture. Stir just until combined. Gently stir in the raspberries.
Divide the batter among the prepared muffins cups, filling each about 3/4 full. If desired, sprinkle the top of each with a pinch or two of sanding sugar.
Bake for 5 minutes. Then reduce the oven temperature to 375°F (190°C) and continue baking for 10-14 minutes, or until the edges are browned and a pick inserted into the center comes out clean.
Cool the muffins in the pan 5 to 10 minutes before serving.
Notes
Store in an airtight container at room temperature up to 2 days.