1.Remove the skin of the orange and lemon (removing the white pith so it’s not bitter).
2.Juice the orange and lemon, then add the grapefruit juice as well.
3.Heat the citrus juice in a saucepan with a tablespoon of sugar and the citrus peel.
4.When it starts to boil, cook about five or ten minutes over medium-high heat until reduced by about half.
5.Strain and set aside in a bowl to cool.
6.Add a tablespoon of honey mustard, a little extra virgin olive oil, and salt and pepper to taste, then stir well until emulsified.