It is hard to measure precisely the amount of oil and vinegar because every grocery store has different sizes of bunches of parsley or dill. Start with adding as much as in the recipe but if the relish is too dry or not sour enough, add one tablespoon of oil and vinegar at a time. The proportions of oil and vinegar in this relish should remain 1:1. You might also add 1/2 tsp. more of salt if this is your preference. Keep this condiment in the fridge.