Sup Ubi Jalar dengan Kembang Kol Panggang

Bahan-bahan (6 porsi)

• 1 red onion, cut into large chunks or slices
• 3 sweet potatoes, cut into chunks (about 6 cups)
• 2 tablespoons avocado oil or olive oil
• 1 teaspoon coarse kosher salt
• 6 cups vegetable broth (see notes)
• 1/2 inch knob of fresh ginger
• 1/2 cup macadamia nuts or cashews
• 4 -6 cups cauliflower florets
• a small bundle of chives, chopped
• lemon wedges
• a drizzle of infused oil (I like a spicy chili oil)