This gluten-free Rhubarb Syrup for Pancakes is as delicious as it is pretty. Make sure you choose rhubarb that is red rather than green. There really isn't much of a taste difference, but red rhubarb makes a much prettier sauce. You will also want to discard the leaves as they can be poisonous. Now for my secret. If you make a thinner consistency syrup, you can also use it salad dressings, cocktails, and more. A thicker syrup also makes a great topping for ice cream.