The mustard will be wildly hot when first mixed and mellows with age. Refrigeration stops the mellowing. Place the mustard in a tightly sealed jar and give it at least 5 days on the counter. Try it daily. Put the mustard in the refrigerator when it reaches the desired heat. When preparing the recipes, the mustards will be a bit thick, it’s what I prefer. If you find you want it thinner, add a smidgen of liquid until you get your desired consistency.