Peel the shallots, cut in half and eighth lengthways. Wash the tomatoes, quarter them and remove the stalks. Rinse the chives and basil, shake dry and finely chop.
Sweat the shallots in a pan with olive oil, add the tomatoes and fry them. When everything is well and hot, transfer to a bowl. Season with salt, pepper and a pinch of sugar. Mix in a little olive oil and balsamic vinegar and finally fold in the herbs.