Lay the tomatoes out on your cutting board and sprinkle evenly with about ½ teaspoon salt. Let them sit for 10-20 minutes, then blot them with a paper towel to absorb the excess moisture.
Add the tomatoes to a high-speed blender along with the olive oil, tomato paste, garlic, and remaining ½ teaspoon salt. Blend until smooth.
Bring a large pot of water to a boil and season generously with salt. Add the pasta and cook according to the package instructions. Drain and immediately transfer back to the pot.
While the pasta is still piping hot, pour the tomato sauce all over and stir vigorously for 1-2 minutes to allow the pasta to absorb some of the sauce. It will be very saucy/liquidy. If it’s too dry, you can add some pasta water.
At this point, the pasta should be cooled off quite a bit from being mixed with the sauce. It’s meant to be eaten just warm. You can let it sit for a few minutes if it’s still super hot, then stir in the mozzarella cheese.
Serve topped with your protein of choice, parmesan, basil, black pepper, and a drizzle of good olive oil. Given the sauciness of this pasta, it’s best eaten with a spoon or at least have one nearby to scoop up the sauce.