Spring vegetable and prawn thermidor tart

Fruit and vegetables

2 spears of asparagus, sliced in half lengthways

½ tbsp finely chopped dill

1 lemon, juice only

½ tbsp finely chopped parsley

salt and pepper, to taste

3 spears purple sprouting broccoli

3 radishes, halved lengthways

1 shallot, finely chopped

3 spring onions, sliced in half lengthways

small handful watercress, to serve