Spearmint Lime
What goes in
| Ingredient | Volume | Weight |
|---|---|---|
| Fresh lime juice | 2 cups, from 15–18 limes | 480 g |
| Lime zest | 2 tablespoons | — |
| Spearmint leaves | 1.5 cups, loosely packed | 30 g |
| Organic cane sugar | 3.25 cups | 650 g |
| Water | 3.25 cups | 770 g |
| Vodka | 2.5 tablespoons | 35 g |
How it’s made
Steep the mint
Combine the water and sugar in a medium saucepan over medium heat and stir until every crystal is gone. Don’t let it boil — you want syrup, not caramel, and the water you boil off is water the recipe counts on.
Take it off the heat the moment it’s clear. Slap the mint between your palms once or twice to bruise it, drop it in, put the lid on, and leave it to steep for fifteen to twenty minutes.
Zest and juice
While the syrup steeps, take two tablespoons of zest off the limes with a microplane, making sure you get the vibrant green skin, not the tart white pith underneath.
Roll each lime firmly under your palm to loosen it, halve it, and squeeze until you have two cups. Run the resulting juice through a fine-mesh strainer as you pour it into a bowl or pitched to remove the seeds and the heavy pulp.
Combine
Pour the warm syrup through the strainer into the lime juice, and press the leaves gently with the back of a spoon to get the trapped syrup back. Then discard the leaves — they have nothing left to give.
Whisk in the zest and the vodka until the whole mixture is uniform.
Chill out
Cover the combine mixture and put it on the coldest shelf of the refrigerator until it reaches about 40°F (4°C). Overnight is better.
This is where I messed up the first batch I ever made by being impatient. A mixture that goes into the machine warm freezes in large crystals, and no amount of churning afterwards will grind them back down. (Thankfully if you make this mistake, you can thaw the "bad" sorbetto on the counter for a bit before returning to this step again.)
Churn and harden
Stir the mixture to make sure nothing has settled, like the zest, and pour it into the machine. In a 1.5 or 2 quart bowl, this is two batches — trying to squeeze it into one gets you a bowl of cold soup, since the mixer is unlikely to be able to handle freezing all two quarts at once.
Run it thirty to fourth minutes, until it resembles thick soft-serve. Transfer it to airtight containers you’ve had in the freezer, press a sheet of parchment flat against the surface, and give it two to three hours to firm up before anybody gets a spoon. (Well, you can take a taste at this point, you earned it!)
Why it works
The vodka isn’t for flavor
Alcohol lowers the temperature the mixture freezes at, which is the whole trick: the sorbetto sets soft enough to scoop instead of solid enough to chip. Two and a half tablespoons across two quarts is well under anything you could taste. Light corn syrup does the same job if you’d rather not use vodka.
Slap the mint, don’t chop it
A slap ruptures enough cells to let the aromatic oils out. A knife goes further and brings the bitter compounds with them. I steep the leaves after removing heat, and under a lid, for the same reason: the flavors you want condense on the lid and fall back into the syrup instead of leaving in a puff of steam.
Cold before it’s cold
Ice crystal size is set at the moment the water freezes, and a warm base freezes slowly enough to grow big ones. 40°F going into the machine is the entire difference between silky and gravelly, and it costs nothing but patience.
Cane sugar?
Organic cane sugar provides a faint caramel warmth that regular refined sugar doesn’t have. It changes the color though! What would be a pale green becomes a warm off-white color, and takes longer to dissolve into the water.
Knowing when to stop
If your machine has a forty-minute preset for sorbet like mine does, it isn’t being cautious. Sorbetto is mostly water and contains no milk fat to build body from like ice cream does, so the paddle has to do that work itself — and the vodka lowers the freezing point on purpose, which gives the machine further to travel.
Don't let the clock dictate this step. If it gets there at minute twenty-eight, stop at minute twenty-eight: past soft-serve the paddle starts driving the air back out, and the friction warms the bowl, fighting the entire freezing process.
- It looks like thick, glossy soft-serve and holds its shape.
- It pulls away from the side of the bowl and starts climbing the dasher.
- The motor drops in pitch and sounds like it’s working for a living.