Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large bowl, combine the ground beef, breadcrumbs, eggs, milk, onion, garlic, salt, and pepper. Mix gently with your hands until just combined — don’t overwork it.
Shape the mixture into a loaf on the prepared baking sheet, about 9 by 5 inches.
Bake for 45 minutes, then spread 2 tablespoons of tomato paste mixed with a splash of water over the top.
Bake for another 15 minutes, until the internal temperature reaches 160°F (71°C).
Let rest for 10 minutes before slicing. Serve with mashed potatoes or roasted vegetables.
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