Pepperoncini - I use whole pepperoncini but sliced pepperoncini can be used.Butter - for a lower salt recipe use unslated butter.If stock is not available water can be substituted. Stock - I use chicken stock, beef stock or even vegetable stock to degalze the pan when I am searing.The white marbling is the fat and fat equals flavor. Chuck roast - Look for a good marbled chuck roast.Scroll down to the recipe at the bottom for quantities. Here is a visual overview of the ingredients in the recipe. Two different cooking methods depending on how much time you have.If there is leftovers, the leftovers are amazing the second day.the 3 to 4 hours it can take cooking in the oven, or 8+ hours in takes in a slow cooker. Pot roast is on the table in just over an hour, vs.📝 Frequently asked questions, answers and tips:.📷 Mississippi pot roast in a pressure cooker, photo instructions.🔪 How to make Mississippi pot roast instant pot.The ease and speed of getting a meal on the table were amazingly fast. This is the first Insta pot recipe that I have created for this site and my whole family loved it! I am normally a sous vide or a crock pot recipe kind of gal but I wanted to give the pressure cooker that I got for Christmas and I think I might be in love.