Cut the watermelon into wedges and core. Save the bowls. Cut the pulp from the skin and dice. Wash the rocket, pat dry and pluck into small pieces. Dice the feta cheese. Peel the onion and cut into wafer-thin slices. Pluck off the herb leaves and roughly chop. Put everything in a bowl.
Mix together lemon juice, olive oil, salt and pepper. Pour over the prepared ingredients, mix and season to taste. Scatter the roasted pine nuts over the salad. Arrange on the hollowed out melon wedges.