Preheat the oven to 400F. Lightly grease a baking sheet with sides with coconut oil so veggies don’t stick. Melt 2 tablespoons of ghee and toss the onion, garlic and carrots until evenly coated. Place on the cookie sheet and lightly drizzle with one tablespoon of ghee. Toss veggies till evenly coated and season with salt and pepper. (You will add the leek halfway through the roasting). Roast veggies till tender and golden, about 35 minutes. (Roasting time depends on the size of your veggies.)