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1
Heat oven to 400u00b0F.
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2
In a 12-inch ovenproof saute or braising pan with 2- to 3-inch sides, combine first seven ingredients (ginger through fish sauce), stirring well to integrate, then stir in sweet potatoes, black-eyed peas, collards, and salt. Tip: for easy prep, use a Microplane (or other rasp grater) to grate the ginger, shallot, and lime zest directly into the pan; don't worry about the exact amounts. (Note: you may get mostly juice when grating your shallot--this is okay!) Alternatively, process the ginger and shallot to a fine paste in a mini food processor or mortar and pestle.
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3
Bring to a simmer over medium heat, stirring a few times to make sure the sweet potatoes and collards are evenly coated in the sauce (if they're not fully submerged, that's fine!). Simmer for a minute or two, then transfer to the oven.
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4
Simmer in the oven (uncovered) for about 30 to 35 minutes, or until the sweet potatoes are tender. Tip: Stir the curry after about 15 minutes to ensure even cooking, and check the tenderness of the sweet potatoes. (Lower heat, if needed, if simmering too vigorously.) Thin with a little extra stock or water, if desired.
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5
Squeeze a little lime juice into the curry, and adjust seasoning to taste with salt or fish sauce. Serve warm over rice, topping with black sesame seeds and herbs, if using.
