Peel and wash the asparagus and cut it diagonally into pieces of about 4 cm. Clean and wash the sugar peas. Boil 1/8 -1/4 litre water with salt, lemon juice and sugar in a large well-closing pot.
Cover the asparagus pieces and cook them at low heat for 10 minutes. Add sugar peas and steam for another 5 minutes. Drain. Remove 4 tablespoons of vegetable stock. Mix with salt, pepper and balsamic vinegar and slowly stir in the oil.
Wash the tomatoes, remove the stalk, quarter the tomatoes and, except for 2 quarters for garnishing, cut into cubes. Turn the diced tomatoes, sugar peas and asparagus in the salad dressing and allow to soak through a little.
Garnish with tomato wedges and basil leaves on a plate.