Preheat your oven to 375°F (190°C) and line a small loaf pan or baking sheet with parchment paper.
In a large mixing bowl, combine the grass-fed beef, egg, almond flour, finely diced onion, diced bell pepper, minced garlic, sea salt, black pepper, and dried oregano.
Gently mix the ingredients by hand until just combined, taking care not to overwork the meat to ensure a tender and light result.
Shape the mixture into a uniform loaf and place it into the prepared pan or onto the baking sheet.
In a small bowl, whisk together the tomato paste, apple cider vinegar, and maple syrup until smooth to create the glaze.
Spread the glaze evenly over the top of the meatloaf using a spoon or pastry brush for full coverage.
Bake for 35 to 40 minutes, or until the internal temperature reaches 160°F (71°C) when measured with a meat thermometer.
Allow the meatloaf to rest for 10 minutes before slicing to ensure the juices redistribute for a perfectly moist finish.