I made this as written with one very minor change; my pressure cooker is large enough to easily brown a roast. I browned the roast first, removed it to a plate then cooked the onions, etc. The dish turned out awesome and my dinner guests loved it! The Orange Zest brings just the right combination of bitter and sweet, then the Mustard Sauce just puts it right over the top of deliciousness. Thank you for another keeper!