Borage vinegar is an herb vinegar, flavoured with borage. The flowers from the borage give it a blue tint.
Some people cheat and add a drop or two of blue food colouring as well.
Use for salads, marinating fish in.
3 handfuls (about 1 1/2 cups) of fresh borage flowers
4 cups (32 oz / 1 litre) of white wine vinegar
Well in advance: wash the borage flowers, shake and pat dry, then let stand for all the water to dry off them completely, an hour or two. Sterilize your jar or bottle. Place the flowers in it. Bring the white wine vinegar to a simmer. Pour into your jar or bottle over the flowers, stir. Let cool, then seal. Let stand in a dark place at room temperature for 3 to 4 weeks, shaking from time to time, then filter into another bottle.