1Heat peanut oil in heavy large skillet over medium-high heat. Add sliced onion; stir-fry until soft and beginning to brown, about 4 minutes. Reduce heat to medium. Add green onions and curry paste; stir until fragrant, about 1 minute.
2Add coconut milk, chicken broth, fish sauce, and sugar; bring to boil. Add tomatoes and boil 2 minutes. Add shrimp and cook just until opaque in center, stirring often, about 3 minutes. Transfer curry to large shallow bowl.
3Garnish with cilantro. Serve, passing lime wedges separately.