In a saucepan over medium heat, stir together sugars and water until the sugar has dissolved. Don't let it boil.
½ cup brown sugar, ½ cup cane sugar , 1 cup water
Stir in pumpkin purée and vanilla extract until combined. Stir in the spices.
¼ cup pumpkin purée, ½ teaspoon vanilla extract, 1 teaspoon ground cinnamon, 1 teaspoon ground ginger, ½ teaspoon ground nutmeg, ¼ teaspoon ground cloves, ¼ teaspoon ground cardamom
Cook for about 10 minutes total, being careful not to boil. Turn off the heat and let the mixture sit for 15 minutes.
Strain through a fine-mesh strainer.
Let cool completely, then store in a food-safe, airtight container, such as a mason jar, for up to 2 weeks.
Notes
Syrup shortcut: Use 1 tablespoon of a pre-made pumpkin pie spice blend instead of cinnamon, ginger, nutmeg, cloves and cardamom. Whole spices: You can totally use whole spices! Ground spices can have a grainy texture if not strained through a very fine-mesh strainer, so whole spices can give you a smoother consistency. Use about 2 cinnamon sticks, 1 whole nutmeg pod (cracked), 1 tablespoon whole cloves, 1 tablespoon cardamom pods (cracked) and 1 tablespoon diced ginger root.Storage: Store this pumpkin spice syrup in the fridge in a food-safe, airtight container (such as a mason jar). Use within 2 weeks, since fresh pumpkin and spices shorten its shelf life.