You can certainly make Guinness beef stew on the stove top, it will just take 2 1/2 - 3 hours to cook instead of under 1 hour in the pressure cooker. Follow the instructions as listed through Step 3 in the recipe card, but add the vegetables to the pot at that point. Cover the pot and simmer over medium low heat for 2 hours or until the meat is almost tender. From there, remove the lid and continue cooking until the meat has reached the desired tenderness and some of the liquid has evaporated, about 30 minutes longer. Remove the bay leaf and thyme sprigs. To thicken, follow the instructions in Step 5 to add the cornstarch slurry. For best results, add half the amount of the cornstarch slurry and add more only as needed.