Rhubarb, rose and pistachio crumble

Method

1. Bash open the cardamom pods and discard the green husks. Use a pestle and mortar to grind the black seeds to a powder, then put them in a small pan with the rhubarb, 40g of the sugar and the rosewater. Bring to a simmer and cook for 5 minutes – the rhubarb should be just softening but holding its shape. Transfer to a baking dish.
2. Heat the oven to 160ºC fan/gas mark 4. Rub the butter into the flour between your fingers until it’s a coarse rubble, then stir in the remaining 80g sugar with the oats, sesame seeds, pistachios and a pinch of salt. Sprinkle this topping evenly over the rhubarb. Bake for 20-25 minutes until golden and crisp on top, then serve with custard, ice cream or vanilla-speckled pouring cream. Or all three!