Preheat the slow cooker while you prepare the ingredients. Cut the potatoes in half and slice the carrots. Drain the peas if using canned.
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Dice the beef into bite size cubes and season the beef with pepper and garlic salt. In a shallow dish add the flour and dredge the beef stew cubes into the flour and coating all sides.
Heat oil in a 10-inch skillet. Brown the beef. The stew meat doesn't need to be cooked, just browned on all sides.
Add the diced onion, minced garlic, potatoes, sliced carrots to a 3-quart slow cooker.
Pour in the beef broth, tomato sauce, and Worcestershire. if using wine in the stew, add it at this step.
Add the browned stew meat and stir. It's fine if you have a few pink spots on the stew meat. Everything will cook up nicely.
Cover and cook on low for 6 hours. Add the peas during the last 30 minutes so they don't get mushy.