Real New Orleans chicory coffee makes a difference. If you can't find it, use a dark roast and brew it strong – the bitterness is part of the balance. The brown sugar syrup is the same one I use for iced tea in summer. Make a batch and you'll reach for it all week. Oatmilk works well here because it doesn't curdle with cold coffee and its natural sweetness plays nicely with the brown sugar. But if you drink dairy, whole milk gives a richer mouthfeel. Celestine would have used whole milk and never looked back. Make it the night before and shake it in the morning for an even faster start.
Keyword brown sugar oatmilk, chicory coffee, iced coffee, quick coffee, shaken coffee