Put oil in a pot on mid heat. Fry onion, garlic, & ginger for 2-3 mins.
Toss in curry paste & fry for 1 min.
Mix in coconut milk, broth, fish sauce, brown sugar, & lemongrass. Let it cook soft.
Put in bell pepper, mushrooms, & zucchini. Let them cook for 5-7 mins.
Add shrimp & let cook for 2-3 mins till pink.
Take pot off heat, mix in lime juice, & toss out lemongrass.
Serve on rice noodles or jasmine rice, with cilantro & Thai basil on top.