Heat a skillet over a medium heat and add in a drizzle of olive oil, then add the diced onion, garlic, celery, carrots and the ground beef. Stir it all together and cook until the beef has browned.
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Pour in the marinara sauce along with the Italian herbs and a pinch of salt and pepper. Stir it all together and let it simmer over a low heat for 30 minutes or until it is lovely and thick and saucy.
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While the meat sauce cooks, make your white sauce by melting the butter into a small saucepan. Use a whisk to add the flour in to the butter and whisk to make a smooth roux.
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Slowly pour the whole milk into the saucepan and then keep whisking over a low heat until it thickens. Be sure to keep a close eye on it, otherwise it will become lumpy.
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