Slow Roasted Sweet Potatoes with Ginger Lime Butter and Charred Broccoli

By now, given that it’s not only all over Pinterest, but both Saveur and Smitten Kitchen have a version (though to be fair, hers is based on Saveur’s offering), you probably know about slow roasted sweet potatoes which means I am completely overdue unoriginal on trend with this one. But that’s okay. As a scholar of medieval texts, I am nothing if not interested in old material. Besides, this one comes with thanks to Chef Alex Guarnaschelli and her propensity to respond to people’s recipe request tweets – while tweet-stalking fangirling scrolling through my feed last week, I noticed a reader ask advice for a lamb chop dish, and Alex recommended a side of sweet potatoes with a ginger butter.

That was all the light-bulb I needed for how to dress up these already-basically-perfect sweet potatoes, roasted for an agonizingly long time until their sweetness deepens, and their flesh collapses into rich orange velvet, and their skins need the barest flick of a fork to split, and just before serving you can shove them under the broiler just until they start to blister and crackle for extra texture. Ginger would be delightful here, cutting sharply through the butter and the starchy softness of the potato (you keep your fresh ginger in the freezer, right, for easy grating?). I knew immediately I would add some brown sugar, or maybe some maple syrup, but set all that off with a generous grating of lime zest to keep it from becoming just deconstructed sweet potato pie (though honestly, that doesn’t sound like such a bad thing…). And rather than make them play second fiddle to some protein, these would be the central feature of our plates.

An almost-dessert main requires a sidekick to keep it oriented, so our vegetable costar would have to be savory and kicky and intense. I went green. Broccoli, sliced into thick, steak-like slabs to expose flat, crisp-tender centers of each stem, aggressively seared until deeply bronzed, then tossed with a pungent mixture of lime juice and fish sauce for that deep, salty-savory funk. At first taste, N. was thrown off by the sourness of the sauce combination, and I’ll admit, it is strong. But then he kept coming back for more, as the briny strangeness seeped temptingly into the bright florets.

This is a weekend meal to be sure, given the length of time needed for the potatoes. But it’s largely hands off; once you stow them in the oven, glistening with oil and scattered with salt and pepper because we are going to eat every shred of that skin, you can putter around, or sink into a movie, or venture out into whatever sort of garden you might be planning for, or indulge in a cat nap, or continue your binging of season two of Jessica Jones; you are free for whatever needs doing until it’s time to char the broccoli and lick your plate.

Slow Roasted Sweet Potatoes with Ginger Lime Butter and Charred Broccoli
Serves 4
About 2½ hours
For sweet potatoes:
4 large orange-fleshed sweet potatoes, approximately equal in size
1 tablespoon olive oil
salt and pepper
For ginger lime butter:
4 tablespoons unsalted butter, softened but not melted
zest of 2 limes
1 tablespoon grated fresh ginger (keep it in the freezer for easier grating) OR 2 teaspoons ground ginger
2 tablespoons brown sugar or maple syrup
For charred broccoli:
1 pound broccoli
3 tablespoons vegetable oil
2 tablespoons sesame oil
1 tablespoon lime juice
1 tablespoon fish sauce

 

  • Preheat the oven to 275F. While it warms, line a baking sheet with aluminum foil. Rub the sweet potatoes with the 1 tablespoon olive oil, arrange on the lined baking sheet, and sprinkle each generously with salt and pepper. Place carefully into the oven and bake at 275F for 2½ hours.
  • While the sweet potatoes take their sweet time, make the ginger lime butter. In a small bowl, use a spoon or a spatula or a small whisk to whip together the softened butter, the lime zest, the ginger, and the brown sugar. Once fluffy and well combined, cover with plastic wrap and stow in the fridge until a few minutes before it’s time to eat.
  • When the sweet potatoes have about ½ hour left to bake, start on the broccoli. Combine the 3 tablespoons vegetable oil and 2 tablespoons sesame oil in a small bowl. Cut the broccoli into large, steak-like slices straight across the head – the point is to have lots of flat sides of broccoli flesh to lay against the pan.
  • Heat about 1 tablespoon of the oil mixture in a large skillet over high heat. When the oil is shimmering but not quite smoking, carefully arrange slices of broccoli over the surface in a single layer. Try not to crowd; you will likely need to do this in a few batches. Cook without moving until the underside of each broccoli slice is deeply bronzed, around 2-3 minutes depending on your stove. Flip each piece over and repeat, so both sides are darkly browned and the broccoli is barely tender. Remove to a bowl or serving dish and repeat, adding more of the oil mixture when needed, until all of the broccoli is cooked.
  • While you are cooking the batches of broccoli, whisk together the 1 tablespoon lime juice and 1 tablespoon fish sauce in a small bowl. When all of the broccoli is done, pour on the sauce mixture and toss to combine.
  • After 2½ hours, the sweet potatoes are done. For an extra layer of flavor and texture, if you wish, set them under your broiler on high for a few minutes just before serving, until the skin blackens and crackles just a little bit, then carefully remove to a plate, split down the center, add a heaping helping of the ginger lime butter, and serve with a side of the broccoli.

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