Serves 6

12 large spring onions, trimmed 150g chilled unsalted butter, cubed, plus extra for greasing 250g plain flour, plus extra for dusting 5 eggs, plus 1 egg yolk 5 tbsp ice-cold water 200ml double cream 400g crab meat 2 garlic cloves, peeled and finely chopped 30g fresh mint, finely chopped zest and juice of 1 lemon sea salt and black pepper baking beans 25cm tart dish