Melt the butter in a small saucepan over the lowest possible heat. Melting the butter slowly ensures that the sauce will emulsify and thicken later.
Once melted, take the butter off the heat and grab your whisk. Measure out approximately how much hot sauce you want to use.
A tablespoon at a time, whisk the hot sauce into the butter. Adding the hot sauce gradually will help the sauce emulsify and prevent it splitting.
Add the hot sauce to taste. The sauce should thicken slightly and become a vibrant orange hue. A few shiny spots of butter might be visible on the top of the sauce.
When you're happy with the flavour of the hot sauce, add your remaining flavours to taste. Whisk, taste and adjust as necessary.
If your sauce is looking a bit thin, return it to a very low heat and whisk constantly until it thickens a little. Keep in mind it doesn't become super thick - it should coat a spoon but drip back into the pot if you flip the spoon over.
Use immediately and keep leftovers in an airtight container in the fridge. To reuse, repeat the process of heating the sauce over a very low heat. Some solidified butter is expected prior to reheating the sauce.