Do I really have to stir and scrape it?
You do not have to hover, but a few scrapes are what make granita granita. If you freeze it untouched, you'll get a lemon ice sheet. Still tasty, just not fluffy. Aim for scraping every 30 minutes for the first couple of hours.
Why is my granita too hard?
Usually one of three things: your pan is too deep, you did not scrape enough early on, or your freezer runs very cold. Let it sit 5 to 10 minutes, then go at it with a fork. Next time use a wider, shallower pan.
Why is my granita too slushy or not freezing?
A few common culprits: the base went into the freezer warm, your freezer is not very cold, the pan is insulating (glass and ceramic freeze slower than metal), or you added a little too much alcohol. Pop the pan in the coldest part of your freezer, give it more time, and skip alcohol or use less next round.
Can I make it less sweet or more sweet?
Yes. After mixing, taste the liquid before freezing. It should taste slightly sweeter than you want the final granita to be because freezing dulls sweetness. Add more sugar 1 tablespoon at a time, dissolving fully. Also note: sugar is not just for sweetness. Too little can make the granita freeze very hard.
Can I use bottled lemon juice?
You can, but fresh tastes cleaner and brighter. If you must use bottled, add extra zest (from fresh lemons) if possible, since zest is where a lot of the magic lives.
How do I make this for a crowd?
Double the recipe and use a large rimmed baking sheet. More surface area means faster freezing and better crystals.
Can I add alcohol?
A splash is great, but keep it modest or it might not freeze properly. Start with 1 tablespoon of vodka or limoncello per batch. If you want more, add it slowly and know that extra alcohol can keep the granita softer, especially in a warmer freezer.