First make the relish. Put the vinegar and sugar, into a small saucepan, along with 60ml of water and ¼ teaspoon of salt. Bring to the boil, then simmer for a minute, stirring once or twice, until the sugar has dissolved. Remove from the heat and, once cool, add the cucumber, ginger, chilli and coriander stems. Transfer to a sealed container and keep in the fridge.

To make the spice paste, place the dried chillies in a small bowl, cover with boiling water and set aside for a few minutes. Put the ground white peppercorns and coriander seeds into the small bowl of a food processor along with the shallots, garlic, coriander stems, turmeric, coconut cream, soaked chillies and 1 tablespoon of the chilli-soaking liquid. Blend to form a smooth purée, scraping down the sides of the bowl a few times.

Put the 145ml of coconut cream into a medium saucepan and place on a medium-high heat. When it begins to simmer, add the spice paste and cook for 15–20 minutes, stirring frequently until thick, clotted and oily. Add the coconut milk, sugar, fish sauce and ¼ teaspoon of salt. Stir gently, then bring to a simmer. Add the asparagus stalks, cook for 4 minutes, then add the prawns and asparagus tips. Cook for another 3–5 minutes, until the prawns are just cooked through, and serve.