This Easy Rhubarb Syrup recipe creates a vibrant and tangy syrup perfect for enhancing drinks. Made with fresh rhubarb, vanilla bean, cardamom, and a touch of lemon juice, it simmers gently to extract deep flavors. Use it in cocktails, sparkling water, or as a sweet drizzle over desserts. The recipe yields about 16 servings and stores well in the fridge or freezer.