How to Make It
Preheat the oven to 375.
Toss the sunchokes with 2 tablespoons of oil and 1/8 teaspoon of salt on a parchment paper–lined baking sheet until well coated. Arrange in a single layer so the chokes are not touching each other. Bake, tossing occasionally, until fork-tender, 35 to 45 minutes.
Meanwhile, heat the remaining 1 tablespoon of oil in a heavy-bottomed medium pot over medium heat. When it shimmers, add the onions and the remaining 1/8 teaspoon of salt. Cook, stirring occasionally, until the edges just begin to brown, about 10 minutes, then reduce the heat to low and continue to caramelize the onions, stirring occasionally, for 20 to 30 minutes, or until the sunchokes are finished roasting. Add the sunchokes and vegetable broth to the pot, increase the heat to high, and bring to a boil. Reduce the heat to low and simmer until the sunchokes fall apart when pierced with a fork, about 5 minutes.
Transfer half the sunchokes to a medium bowl, using a slotted spoon. Transfer the remaining sunchokes and liquid to a blender (you could also use an immersion blender to do this right in the pot; just remove half the mixture first). Add the hemp seeds and blend until very smooth. Add the reserved sunchokes and pulse until they are incorporated, with some texture remaining. Top with your choice of chives, bacon, cheese, or nutritional yeast and enjoy.