Clean and wash the tomatoes. Bring vinegar and 1/4 l water to the boil, steam the tomatoes for 1-2 minutes. Drain well. Wash the herbs, dab dry and remove the leaves. Drain the mozzarella and put it in a glass with tomatoes, herbs and pepper. Top up with oil until all ingredients are covered. Keep closed and cool for 2-3 days
(shelf life approx. 2 weeks)