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Cut meat into 1-inch cubes, discard any large pieces of fat. Fat marbleized into the meat is fine!
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Sprinkle beef with black pepper, garlic salt, and celery salt. Toss to coat. Sprinkle flour over the meat and toss again.
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Heat 3 Tablespoons olive oil in a large skillet over medium-high heat. Add the meat in batches, don’t overcrowd the pan. Brown on each side for 45 seconds. Add more oil if needed. Transfer to slow cooker.
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Reduce heat to medium and melt 1 Tablespoon butter. Add onions and cook for 5 minutes. Add garlic and cook for 1 minute. Add a splash of wine and use a silicone spatula to deglaze the pan, loosening up any brown remnants. This will give the stew lots of good flavor. Transfer the onions/garlic mixture to the slow cooker.
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Add all remaining ingredients except for the peas, corn starch mixture, and 2 tablespoons of cold butter.
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Cook on low for 7 ½ to 8 hours or high for 3½ to 4 hours, until the vegetables are softened and the potatoes are fork tender.
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Add the peas during the last 15 minutes of cooking. Remove the bay leaves and rosemary stem.
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Optional: To thicken, combine ¼ cup COLD water with 3 Tablespoons of cornstarch. Slowly add it to the stew, stirring to incorporate. It will continue to thicken upon standing.
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Turn off the heat. Swirl in 2 tablespoons of cold butter for a smooth, velvety finish. This is a technique that chefs use called “Monter au Beurre”.