Cook curry paste – Heat oil in a large deep frying pan over medium-low heat. Cook curry paste for 5 minutes, stirring constantly. The paste should be drier, darker, smelling aromatic and no longer raw.
Sauce – Add 1 cup (250 ml) prawn stock, being careful to pour off just the clearer liquid and leaving the sediment behind. Stir in the coconut cream, sugar, fish sauce and salt. Mix in the green beans.
Simmer for 2 minutes until the sauce thickens and the beans are half cooked.
Add prawns, stir, then simmer for another 2 minutes until the prawns are cooked. Stir in the Thai basil leaves. The final taste should lean mostly savoury and sweet, and medium spiciness.
Serve over jasmine rice garnished with chopped peanuts, chilli and more Thai basil leaves!