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Preheat oven to 350
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Melt butter with olive oil in a cast iron skillet or oven safe skillet over medium-high heat
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Add carrots and cook 3-4 minutes
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Add onions and cook 2-3 minutes
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Add garlic and cook another 1-2 minutes
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Add ground chuck and lamb and cook until browned, about 15 minutes
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Add rosemary, thyme, salt, and pepper and stir for a minute or so
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Sprinkle flour over contents of pan and stir for 1 minute
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Stir in beef stock and, bring to a boil, reduce heat,add peas, and simmer for about 5 minutes or until it is a thick gravy consistency
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Top with mashed potatoes
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Bake at 350 for 25 minutes
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Turn heat up to broil and broil for another 5-7 minutes