Spiralize or julienne sweetpotato and set aside. Saute onion in olive oil until softened. Add sliced mushrooms and cook until tender. For the sauce, add all ingredients into a blender or food processor. Blend/process until smooth. Add more coconut milk or warm water if too thick. Add sweetpotato noodles to onion and mushroom pan, then stir in sauce. Season with salt and pepper, to taste. Serve immediately.