1. Place a Large pot over medium heat, add in your broth and water and bring to a boil. 2. Once it is boiling, bring heat down to a simmer, add the garlic, lemon grass, and chili. 3. Continue to simmer and add in tomato, onion, mushroom, and lime juice. 4. Cook until the vegetables start to become soft (about 5-7 minutes) and add the shrimp. 5. Stirring occasionally, when the shrimp has finished cooking it will be a dark red or pink color, another 6-8 minutes. When the shrimp is cooked add fish sauce and sugar.