"To squeeze the lemon" means to get the maximum benefit or effort out of something or someone. It often refers to putting pressure on a situation or person to achieve the most favorable outcome. Full definition
We finished them off with freshly squeezed lemon juice for a flavor pop and additional moisture, but try topping them with a bit of hot sauce as well. (chilipeppermadness.com)
Sprinkle a little fresh squeezed lemon juice into the mix and a quarter teaspoon of fresh lemon zest. (remonline.com)