Alliums, and onions in particular, are one of the most common ingredients in savory foods of all kinds. Both Mad Kitchen Scientist and Chef Spouse have cutting boards dedicated just to alliums (because the last thing you want to do is cut up strawberries on a board that retains essence of garlic no matter how many times you wash it). Even if you're not sure what you're making for dinner, starting by mincing some garlic, dicing a shallot, or chopping up an onion is rarely going to be a waste of your time.
The thing is, we rarely pay much attention to our alliums. And there are so many varieties! Chives, garlic, scallions, spring onions, shallots, leeks, pearl onions, cipollini onions, white/yellow/red onions, sweet onions, Spanish onions, Vidalia onions, and of course, that elusive, delicious signifier of the season (and our special guest on Sunday) - ramps.
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| Check out the tissues - we came prepared. |
Sure, there are some rough associations: scallions as a finishing element, raw - shallots for French techniques and pan sauces - garlic that features prominently in Italian and Chinese cookery. But most of us just grab a string bag of onions and a bulb of garlic in our weekly run to the grocery store and figure we're good to go for another week's worth of dinners.
So we started with testing taste: Do they taste different? Yes, that meant tasting them all raw.
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| That's a LOT of raw onions, son. |
Short answer: they definitely all taste different, and the Food Lab crew highly recommends you do your own taste-off, preferably with a group that's also tasting with you, so you're not the only one with dragon breath at the end.
A few tasting notes:
Ramp tops are amazing - mildly peppery like really young arugula, but more more tender, and with a freshness that screams "SPRING!" If you get your hands on ramps in the spring, the temptation is to toss them with good olive oil, salt, and pepper and lightly grill them, and I won't judge you if you do. But you might want to consider - just consider - chopping the tops into a salad and then pickling the bulbs.
Scallions really should never be cooked.
Cipollini onions are supposed to be sweeter than regular onions. That's a lie - at least with the ones we had. The zing on the palate was wasabi-level WHOA. I believe The Executive Committee may actually have been crying for a moment.
If you're going for raw applications, you REALLY want to look for Vidalia or sweet onions. If you can't find them, red onions will work, but the Vidalia and sweet were definitely more mild and sweet, delightfully crunchy, and almost a bit creamy.
There wasn't as much difference in taste between pearl white, yellow, and red and regular sized white, yellow, and red as I would've imagined.
We then caramelized all the main varieties separately to see if they maintained their taste differences.
Caramelization is about slowly cooking off all the water in the onions until they're a sweet and savory brown mass of umami goodness while also avoiding generating a Maillard Reaction. So low and slow, use cast iron, and salt early (remember, you're trying to cook all the water off). Also, set aside 45 minutes - one hour. No rushing!
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| You cannot IMAGINE how good the kitchen smelled |
One of the surprising differences was how much water the varieties contained. We started with precisely 565 g of each type, cooked in 2 TBSP butter, and identical amounts of salt. Most varieties, when the water was cooked off, ended up around 150 g. Not the Vidalia and the red onions though - they both ended up more like 250 g. Less water in the onion --> higher yield after caramelization.
The sweet and Vidalia onions retained their distinctive creaminess and were more mild and subtle in flavor overall after caramelization. The rest of the varieties tasted pretty similar, other than the red onions, which were both strong and sweet and retained a little more structural integrity than the other varieties - see above, RE: less water.
So once we had an absurdity of caramelized onions, then what?
Caramelized onions freeze really well, in your handy-dandy ice cube trays, and we did plenty of that, for later use in any and all egg applications and grilled cheese and pan sauces and finishing soups. But we needed to make something we could eat - Food Labbers cannot live by raw onions alone (for which everyone else who knows or encounters us is deeply grateful).
We opted for galettes, which are basically pizzas that you make on pastry dough, or very rustic tarts. One variety was caramelized onions, Gruyere, green garlic and ramp leaves. The other was fig spread, caramelized onions, leeks, and blue cheese.
Of course, we grilled some ramps, and The Executive Committee made a lovely spring salad of radishes, snow peas, ramp tops, and ricotta salata (she is, after all, the one who makes sure we eat our veggies).
All this is pretty standard order. You know Mad Kitchen Scientist and I couldn't leave it at that.
What's missing?
Dessert.
Oh yes we did make caramelized onion ice cream - vanilla custard base, the Vidalias, and toasted pecans. It was un-fucking-believable. So very, very good. This should definitely become a food trend, and if it does, make sure you point out that we discovered it first.
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| Onion ice cream. It's a thing (or should be). |
What did we drink? Gin, of course, first blind-tasting Bombay Sapphire, Hendricks, The Botanist, and the FEW barrel aged gins against each other in gibsons with home-pickled pearl onions (my favorite, and still the reigning champ, is Hendricks), then Chef Spouse used some saffron gin he'd picked up for me on a whim that has turned out to be VERY difficult to mix in a light cocktail featuring Cointreau, blanco vermouth, and orange bitters.
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| Our gin game is strong. |
We did one other test, caramelizing onions in the Dutch oven on the Green Egg. As of 8 pm, when Chef Spouse and I had to get home to feed all our beasties, they were nowhere near done. I assume they finished in time for Mad Kitchen Scientist to go to work Monday, but I haven't confirmed yet. For all I know, he's still sitting there by the Green Egg watching the onions cook down and contemplating the universe. At least the weather's been delightful the past three days.
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