Heat a large pan over medium heat and add the red curry paste.
Cook for 1-2 minutes until fragrant, stirring constantly.
Add the chicken or tofu and cook until browned on all sides.
Pour in the coconut milk and vegetable broth, stirring to combine.
Bring the mixture to a gentle boil.
Add the bell pepper and broccoli florets.
Stir in the fish sauce and sugar, and simmer for 15 minutes.
Adjust seasoning to taste, adding more fish sauce if desired.
Serve the curry over jasmine rice.
Garnish with fresh cilantro before serving.