Use a wire whisk to mix the ¾ cup sourdough discard, 1 cup buttermilk, ½ cup ricotta cheese, 4 tablespoons unsalted butter, 2 large eggs, zest and juice of 1 large lemon in a batter bowl until smooth.
Add 2 cups all-purpose flour, 3 tablespoons granulated sugar, 1 teaspoon salt, 2 teaspoons baking powder, 1 teaspoon baking soda, and mix until just combined. Some visible lumps are ok, but do not overmix. Let the batter rest while you preheat the griddle or a cast iron skillet.
Pour ¼ cup of batter onto the griddle or skillet and spread out gently into a round shape with the back of your ladle or measuring cup. Cook until bubbles form on the surface, the edges are dry, and the underside is golden brown, about 2 to 3 minutes. Flip and cook until golden brown on the other side. Repeat with the remaining batter.