You can put vanilla in all kinds of things and you won’t go wrong, but vanilla with lavender and citrus? This is a winning combination. I think it might be some kind of holy trifecta; at the very least it’s Three Musketeers status.
Burnt sugar syrup is a great way to create "instant aged" liquors, flavor homemade bitters, or simply add depth and complexity to cocktails. (Plus: a chance to win the new, awesomely geeky cocktail science book Craft Cocktails at Home!)