To make pistou, place asparagus, garlic and oil in a food processor or blender. Pulse until creamy. Mix in lemon juice, fresh mint or herbs and season with salt and pepper. Refrigerate until ready to use.
On a medium round platter, place fresh mozzarella quarters in the centre. Lay prosciutto slices around the fresh mozzarella. Cut asparagus heads off and slice in half lengthwise and evenly top on prosciutto and mozzarella. With a peeler, shave asparagus lengthwise to make ribbons and spread on platter. Add olives and fresh mint leaves.
To make vinaigrette, in a medium bowl, add two tablespoons of asparagus pesto, 2 tbsps of olive oil, lemon juice, salt and pepper. Whisk and drizzle on top of salad.