Heat oven to 350 deg F. Butter a 9x5 inch loaf pan, trim a piece of parchment paper so it fits lengthwise and hangs over the long edges by a few inches. Butter the parchment paper then lightly flour, tapping out any excess.
In a large mixing bowl rub together the sugar and zest with your fingers until the sugar is very fragrant. Add in the oil and mix well either with a whisk or hand mixer. Add in the eggs, ricotta cheese, lemon juice and extract and mix again well. Add in the flour, baking powder, baking soda and salt then stir to combine, batter will be a little lumpy. If you want you can whisk together the flour, baking powder, soda and salt together in a small bowl first but this step isn't really needed. It can be done all in one bowl.
Pour batter into prepared loaf pan and smooth the top.
Bake for 40-45 minutes or until golden on the top and a toothpick inserted into the middle comes out with just a few crumbs.
While the loaf is baking whisk together the powdered sugar and lemon juice.
As soon as the loaf is out of the oven spread half the glaze over the top, making sure it soaks into the loaf. You can poke holes all over first, just an inch or so deep with a skewer first if you like then glaze. Cool completely then remove from the pan using the parchment to lift it. Slide the parchment paper out from under the loaf and place the loaf on a serving plate.
Spread the remaining half of the glaze slowly over the top, then sprinkle the lemon zest on top. Once the glaze has fully set it is ready to serve.