In a large skillet, heat the avocado oil over medium-high heat. Add in the onion, and cook until translucent, about 7-10 minutes. Add in the garlic, tomato paste, mustard powder, cumin, and paprika. Sautee for another 30 seconds. Add in the tomato sauce, pumpkin puree, and maple syrup. Cover and simmer for 10 minutes.