Preheat your oven to 375°F (190°C). Line a rimmed baking sheet with parchment paper.
In a large mixing bowl, combine the ground beef, cooked and cooled couscous, 1/2 cup of the tomato sauce, chopped parsley, eggs, chopped onion, minced garlic, salt, and black pepper. Mix gently with your hands until just combined, being careful not to overwork the meat.
Transfer the mixture to the prepared baking sheet and shape it into a 9x5-inch loaf.
Spread the remaining 1/2 cup of tomato sauce evenly over the top and sides of the loaf.
Arrange the cherry tomatoes on the baking sheet around the base of the loaf.
Bake in the preheated oven for 55 to 65 minutes, or until a meat thermometer inserted into the center reads 160°F (71°C).
Remove from the oven and let rest for 10 minutes before slicing and serving alongside the roasted cherry tomatoes.