Ice cream is basically custard that’s been stirred to add air and then chilled. If you know how to make custard or “crème anglaise” then you know how to make ice cream 🙂
The main difference between ice cream and gelato is the amount of fat. Ice cream is made with more cream and eggs, it’s fattier than gelato. It has a creamier texture and is chilled at a cooler temperature, which means it won’t melt as fast. Gelato is made mainly with milk and only a little cream if any and less eggs. Both contain sugar but you don’t need much.
Sorbet is a different kind of chilled treat as it’s not custard-based. It’s made of fruit (or chocolate), water and sugar. Some add milk to give more texture but it’s not mandatory. If you’re lactose-intolerant, sorbet is the way to go. I guess I should share a recipe on the blog 🙂