Heat the oil in a large deep frypan over medium heat, then add the paste and cook, stirring, for 1 minute or until fragrant. Add the spring onion, fish sauce, sugar, broccoli, coconut milk and 1 cup (250ml) boiling water. Stir to combine and bring to the boil, then reduce the heat to medium-low and simmer for 3 minutes. Add the coriander and beans and cook for 2 minutes or until the broccoli is tender. Remove from heat, then gently stir in tofu and basil. Serve with rice and extra basil.