Boil water in a saucepan and add 1 tsp salt to it
While the water is boiling, trim and cut the french beans, cut the cherry tomatoes into halves, chop the red onion and set aside
Put the french beans into the boiling water and blanch them for about 4-5 minutes until crisp tender
Drain the french beans and shock them by putting them in ice cold water 2-3 minutes to retain the bright green color
Drain the french beans again and set aside
Mix the balsamic vinegar, olive oil, Dijon mustard, fresh basil, fresh parsley, salt and black pepper for the dressing in a container
Add french beans, tomatoes and red onion to the dressing container
Toss and serve