For the cookies

1. Line 2 baking sheets (or cookie sheets) with parchment paper. Preheat the oven to 375 degrees F.
2. In the bowl of a stand mixer, or using an electric mixer combine the butter and the sugar. Beat the butter and sugar on medium speed until light and fluffy, about 5 minutes. Add the eggs, 1 at a time, mixing between additions until well incorporated. Add the ricotta cheese, lemon juice, and lemon zest. Beat to combine.
3. In a medium mixing bowl combine the flour, baking powder, and salt. Sift in the dry ingredients into the bowl of the wet ingredients. Tightly cover the dough with plastic wrap and refrigerate for 30 minutes and up to overnight.
4. Scoop the dough (about 1 heaping tablespoon for each cookie) onto the baking sheets. Bake for 12-14 minutes, until cooked through but still pale (do not overbake!). Remove from the oven and let the cookies rest on a cooling rack for about 15 minutes. Repeat the process with the remaining dough.

For the glaze 

1. For the glaze, combine the powdered sugar, lemon juice, and lemon zest in a small bowl and whisk until smooth. Dip each cooled cookie in the small bowl of lemon glaze. You can also spoon the glaze on top of the cookie with the back of a spoon. 
2. Let the glaze harden for about 2 hours at room temperature.