Denise Marchessault on Instagram: "✨Make your roux (gravy thickener) in advance and you’ll have one less thing to worry about when preparing your holiday meal. When you’re ready to make gravy, just drop a cube of frozen roux directly into hot stock. And don’t forget to add the pan drippings! 1 cube (about 2 Tbsp) will thicken 1 cup of liquid. ✨To make a roux: Melt ½ cup butter in a medium saucepan over medium-low heat. Whisk in ½ cup all-purpose flour and cook for 4–5 minutes, stirring constantl