How to Make It
Preheat the oven to 375°. On a rimmed baking sheet, toss the sunchokes with 1 tablespoon of the oil and season with salt and pepper. Roast for about 30 minutes, until tender; let cool completely.
Meanwhile, in a small skillet, heat 1 tablespoon of the oil. Add the onion and garlic and cook over moderate heat until softened and just starting to brown, about 7 minutes. Scrape the onion and garlic into a food processor and let cool.
Add the sunflower seeds and the cooled sunchokes to the food processor and puree. Add the lemon juice, paprika, serrano, onion powder, honey and the remaining 1/4 cup of oil and puree until nearly smooth; season with salt and pepper. Scrape the spread into a bowl.
In a small bowl, whisk the oil with the lemon juice, vinegar, sugar and oregano; season with salt and pepper. Arrange the vegetables on plates or a platter, drizzle the vinaigrette on top and serve with the sunflower spread.