Combine the spices together and store in an air tight container.
Remove the pork roast from the refrigerator. Place it on a sheet pan or tray. If you are using a boneless roast there will be a pocket where the bone was. Season this area, close and generously season the roast on all sides. Allow the roast to sit at room temperature for about 30 minutes.
Set the Instant Pot to sauté. Add some olive oil to the insert pan to cover the bottom and allow to heat.
In the meantime, generously flour your roast all over, rubbing it in a little so it will adhere. Place in the hot insert pan. Allow to brown on the first side, then turn and brown on all sides. This will take several minuets, but makes all the difference in the world for those spice flavors to intensify.
Remove the browned roast to a dish. Add your onions and cook for a couple of a minutes, stirring frequently to prevent burning and to start breaking up the bits at the bottom of the pan that are loaded with flavor. Then the onions are a little translucent, add 2 tablespoons flour. Whisk until the flour has cooked through.
Add the chicken stock, whisking continuously until combined and starts to thicken. Add the roast back in. Set the Instant Pot for 45 minutes.
After the 45 minutes, quick release the steam, being very careful. I always place a kitchen towel over it and it won't spray everywhere.
At this time check the doneness of the roast by inserting a fork. You want your roast to be fork tender. If there's still resistance, I'd place the lid back on and set the timer for an additional 30 minutes. After that, allow the roast to naturally release the steam.
After it has released, add the carrots, replace the lid and cook 10 minutes. Quick release.
Remove the roast and place on a platter. Allow the roast to rest for about 15 to 20 minutes. You should have a very nice thickened gravy left in the pan. Check for seasoning. Add more salt and pepper if needed.
To serve, slice the roast onto a platter and ladle the gravy over the roast. Great with mashed potatoes or rice. Make good use of that gravy! Bon appetite.