I start by adding the water, granulated sugar, and brown sugar to a medium saucepan over medium heat. I stir it gently and let it warm up for a couple of minutes. You want the sugars to fully dissolve before you move on, so don't rush this part.
Once the sugar has dissolved, I stir in the pumpkin puree, cinnamon sticks, nutmeg, ginger, and cloves. I whisk everything together so the pumpkin doesn't clump up at the bottom of the pot. The mixture will start smelling incredible almost immediately.
I drop the heat down to low-medium and let the syrup simmer gently for 5-6 minutes. I never let it come to a full boil, since that can make the sugar seize or turn the syrup a little grainy. A gentle simmer is all it needs.
Once it's done cooking, I pour the hot syrup through a fine mesh strainer into a heatproof bowl or measuring cup. If I want it extra smooth, I'll line the strainer with a paper towel or cheesecloth first to catch every last bit of pumpkin fiber and spice.
I let the strained syrup cool to room temperature for about 15-20 minutes before pouring it into a clean glass jar or bottle using a funnel. Once it's bottled, it goes straight into the fridge, ready whenever I want a homemade latte.