what are the conversions to USA cups instead of weight? Can I omit limncello or replace with same vol. milk or water?

Concerning the substitute for lemoncello, I would use additional lemon juice, or maybe orange juice if you are concerned that 1/2c. may be too much lemon flavor.

Hi Cheryl, weight does not always equal a specific volume as some ingredients are inherently more dense than others. Here is a good conversion website that allows you to input specific ingredients to translate volume (cups) to weight (grams) or visa versa: https://www.thecalculatorsite.com/cooking/cups-grams.php From one cook to another, may I suggest you purchase a kitchen scale? Oxo makes a readily available one that measures in both pounds/ounces and grams. You will find a hundred and one uses for it!