Heat the curry paste in a pan with a spoonful of the thick part of the coconut milk for 3-4 minutes until it reduces, starts to fry and becomes fragrant. Add the rest of the coconut milk and bring to a simmer. Stir in the peanut butter until it dissolves into the sauce. Add the chicken and cook for 15 minutes. Add the cherry tomatoes and cook for 2 minutes or until they just start to burst. Stir in the fish sauce, sugar and lime juice. Stir in the Thai basil and chilli, and serve with rice and the limes to squeeze over.