Rhubarb is here in Michigan and TODAY is the perfect day to make this slightly sweet, definitely sour, shrub that feels like the essence of spring in a bottle! What’s a shrub, you ask? A shrub is your basic simple syrup plus vinegar. The vinegar gives it an interesting complexity and cuts down on the sweetness. This rhubarb shrub makes a really nice and simple spring cocktail when you mix it with ice, gin, and soda water. I recommend adding a sprig of thyme for extra spring freshness.