Culinary Notes
Zest vs. Pith: When grating zest, precision is key. You want only the vibrant yellow outer skin. The white, spongy layer underneath (the pith) is intensely bitter. If you grate too deep and see white, stop.
The Wax Layer: Most supermarket lemons are coated in a food-safe wax to keep them shiny and preserve moisture. If you are using the zest, you must scrub the lemon under warm water with a coarse sponge or brush to remove this layer first.
Juicing Hack: To get the maximum juice yield, roll the lemon firmly on the countertop with the palm of your hand before cutting. This bursts the internal vesicles. If it is cold from the fridge, microwave it for 10 seconds—warm fruit yields more juice.
Acid Cooking: The acid is strong enough to denature proteins. This is the science behind curing fish (making the flesh opaque) without heat, or "curdling" milk to make buttermilk or ricotta.