There is nothing new or unusual about mashed squash or about mashed vegetables on toast. (What’s new is that the toast is now frequently called crostini, but that’s not exactly revolutionary.) Still, there is such a broad range of foods that can be served on toasted bread that it’s not surprising some of these will come as revelations.
This squash-and-toast combination is served by Dan Kluger, the executive chef at ABC Kitchen. Something about it drives me wild: the squash is creamy but chunky, rather than puréed. There is a lot of complex sweetness, but acidity as well, and it’s lean as well as fatty. (It doesn’t take a detective to see the layer of ricotta underneath the squash.)
Put it on a nicely toasted piece of bread and you have a real winner. But it also occurred to me that the mashed squash alone would make a terrific Thanksgiving side dish.
So I asked Dan’s boss, my friend Jean-Georges Vongerichten, to show me how to put it together.
I would not have figured the dish out myself, which made this a rewarding experience. Jean-Georges peeled the squash: almost any winter squash will yield to a sharp knife and some patience, though as I wrote a couple of weeks ago, thin-skinned varieties like delicata are easier to peel or can be left unpeeled entirely. He cut the squash in half, took out the seeds and sliced it into not-quite-random pieces, mostly about 1/4-inch thick. These he roasted with oil until they were tender enough to mash; by that time, a few had blackish, caramelized ends.
To cut to the chase: next, he confited onion slices with both maple syrup and apple cider vinegar. Veteran cooks will immediately get the idea: Cook the onions awhile, until they’re dark and soft, then add the two liquids and continue to cook until they’re jammy. The process could take as long as an hour, depending on the heat, your attentiveness and the water content of the onions. But it isn’t difficult.
At that point, the two preparations are simply mashed together. If you serve them in a bowl at Thanksgiving, you will be serving something on a, er, higher level than mashed sweet potatoes with marshmallows. Otherwise, lightly toast some good bread in olive oil, spread it with a light, fresh cheese and top with the squash. Do not forget the mint; it’s not the same without it.