Preheat your oven to 375°F and line a small baking sheet or loaf pan with parchment paper.
Finely dice the yellow onion and green bell pepper, and mince the garlic clove.
In a large mixing bowl, combine the ground beef, egg, almond flour, diced onion, diced pepper, minced garlic, sea salt, black pepper, and dried oregano.
Gently mix the ingredients with your hands until just incorporated, being careful not to over-compress the meat.
Shape the mixture into a uniform loaf on the prepared baking sheet or press it into the loaf pan.
In a small bowl, whisk together the tomato paste, apple cider vinegar, and honey to create a smooth glaze.
Spread the tomato glaze evenly over the top and sides of the meatloaf using a spoon or brush.
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 allow the juices to redistribute.