Grapefruit and watermelon salad

Method

1. Pare the zest from the whole lemon and segment it by slicing the top and bottom off, using a sharp knife, then slice away the outer skin with even downward strokes. Discard the skin and pith and cut between the membranes to free up the segments, then finely chop. Discard the membranes. Peel and segment the grapefruits in the same way but don’t chop. Set aside the grapefruit and chopped lemon separately.
2. Put the watermelon pieces in a large bowl, add the lemon juice and season well to taste. Set aside for 20 minutes to marinate.
3. In another bowl, mix the ricotta with half the lemon zest and season.
4. Meanwhile, make the dressing. Put the sugar into a saucepan with 100ml water and stir over a gentle heat until dissolved. Bring to the boil and bubble for 5 minutes, until syrupy.
5. Remove from the heat, and immediately stir in the juices from the watermelon (if the sugar syrup seizes, stir over heat until it dissolves). When the dressing is cool, stir in the remaining lemon zest, the finely chopped lemon and mint.
6. To serve, divide the watermelon, grapefruit segments, watercress and red onion between plates. Drizzle with the dressing and dot the lemon ricotta over the top of the salad. Serve with crusty bread to mop up the dressing.