My great grandmother's WWII red roast recipe is made in a pressure cooker. Any cut of roast will work, usually the cheapest is best and will come out very tender! Put the roast in the cooker and cook until just about done, then cut up one big onion on top, pour a thick coating of chili powder on top of the roast and onion! Dump a lot of chili powder to the point where you think it's ruined. Then pour about half a bottle or more of ketchup on top of everything! Put the top back on the pot and cook an additional half hour or so. The chili powder and ketchup make a red gravy that is to die for on top of mashed potatoes. If you want you can thicken the gravy with flour or cornstarch, but we like it as is. The roast will be so tender it will fall apart, due to the chili powder and vinegar in the ketchup. Any left overs are perfect soup stock for vegetable soup. I know it sounds weird but everyone who has ever tried it loves it!!