Heat the oil in a flameproof casserole pot and fry the onion and celery for 10 mins. Add the garlic and fry for 1 min more.

Add the broccoli, peas and stock, bring to a simmer and cook, covered, for 10-15 mins, or until the broccoli is tender. Tip the mix into a blender and blitz until smooth, or use a hand blender. Season. Stir in half the lemon zest and juice, then taste, and add the rest, if you like.

Mix the ricotta with the mint and a pinch of salt. Ladle the soup into bowls, then top with the minty ricotta and the pine nuts. Drizzle over the extra olive oil and scatter with mint leaves, then serve with sliced bread, if you like.