In a large pot, heat the oil over high heat. Add the onion, carrots and celery and sauté 3 minutes, then add the ginger and jalapeños and cook for 2 more minutes. Next, add the garlic, spices, tempeh and sweet potatoes and sauté 2 minutes. Pour in the water, cover and bring to a boil. Reduce heat to medium and boil 5 minutes. Add the diced tomatoes, tomato sauce, sriracha sauce and sugar and simmer 15 minutes until the sweet potatoes are tender.