Preheat your oven to 375°F (190°C) and line a small loaf pan or rimmed baking sheet with parchment paper.
In a large mixing bowl, combine the lean ground beef, whisked egg, almond flour, finely diced yellow onion, and minced garlic.
Add the sea salt, black pepper, and dried thyme to the meat mixture.
Using clean hands, gently mix the ingredients together until just combined, ensuring you do not overwork the meat which can lead to a tough texture.
Shape the mixture into a uniform loaf shape and place it onto the prepared baking surface.
In a small ramekin, whisk together the tomato paste and coconut aminos to create the savory glaze.
Brush approximately half of the glaze evenly over the top and sides of the meatloaf.
Bake for 35 to 40 minutes, or until the internal temperature reaches 160°F, applying the remaining glaze during the final 10 minutes of cooking.
Remove from the oven and let the meatloaf rest for 5 minutes before slicing to allow the juices to redistribute.