Combine all ingredients (brown sugar, honey, cinnamon stick, vanilla bean paste, water) in a saucepan. Bring to a low simmer for 5-7 minutes, watching carefully to prevent boiling over. If using vanilla extract instead of paste, add it at the end, off the heat. Remove the cinnamon stick. Add a pinch of salt. Stir and cool completely. Bottle the syrup and refrigerate. Enjoy in coffee, cocktails, mocktails, on waffles, or with matcha.