Step 1) Mix Dry Ingredients: In your saucepan, combine cocoa powder, sugar, and salt. If your cocoa is clumpy, go ahead and sift it. This makes a difference in how smooth the final syrup turns out. Then give it a quick mix before adding liquid.
Step 2) Add Water and Simmer: Slowly pour in the water while whisking to combine. Next, turn the heat to medium and bring it to a gentle simmer, not a full boil. You want to let it cook for about 4 to 5 minutes, stirring frequently to prevent burning or sticking at the bottom.
Step 3) Add Flavor Boosters: Once the mixture is glossy and thickened slightly, remove it from heat. Afterward, stir in the vanilla extract and, if you want a deeper coffee-chocolate blend, add your espresso shot or instant coffee now. This step is optional, but totally worth it if you love mocha-style drinks.
Step 4) Cool and Store: Let the syrup cool slightly—it’ll thicken a bit more as it sits. Then pour it into a glass jar or a clean squeeze bottle (makes it convenient for morning lattes). You want to store it in the fridge and give it a shake or stir before using.