Preheat your oven to 375°F and line a small loaf pan or rimmed baking sheet with parchment paper.
Finely dice the yellow onion and mince the garlic clove.
In a large mixing bowl, combine the ground beef, egg, almond flour, onion, garlic, sea salt, black pepper, and dried oregano.
Gently mix the ingredients by hand until just incorporated, taking care not to over-compress the meat.
Shape the mixture into a uniform loaf shape and place it on the prepared baking surface.
In a small bowl, whisk together the tomato paste, apple cider vinegar, and honey until smooth.
Brush the tomato glaze generously over the top and sides of the meatloaf.
Bake for 35 to 40 minutes, or until the internal temperature reaches 160°F.
Remove from the oven and let the meatloaf rest for 10 minutes before slicing to retain its juices.