Clean the French beans, break off the tips and draw the broken tips down along the seam to remove the tough fiber that may be present.
Fill a pot with water and white wine vinegar, add a few teaspoons of coarse salt and when it starts boiling throw in the beans.
Let them cook for about 20 minutes until tender but al dente.
Drain the French beans, rinse them under cold water to stop the cooking and arrange them on a kitchen towel to dry them thoroughly before putting them into the jar.
Arrange them standing in a sterilized glass jar, add a few cloves of garlic, one or two bay leaves and a teaspoon of black peppercorns.
Fill the jar with olive oil, making sure that the beans are completely covered.
Close the jar and place it in a cool and dry place, in your pantry for example. Let it sit for at least a month before eating.