Preheat the oven to 400ºF. Line a baking dish or sheet with parchment paper and set aside.
Heat the olive oil or ghee in a small skillet over medium. Add the diced onion and cook until soft. Stir in the chopped spinach, cooking until just wilted. Allow this to cool for a few minutes while you work on the meatloaf.
In a small bowl, combine the tomato sauce, maple syrup, and red pepper flakes. If using dates, blend the soaked dates with tomato sauce and red pepper flakes until smooth.
In a large bowl, combine the beef, pork, eggs, almond flour, spices, and tomato paste with your hands or a large fork, until just mixed. Add the cooled onions & spinach, and mix until combined.
Shape the meat mixture into a loaf about 4 inches high, patting in the sides. Spoon the sauce mixture over the top and sides of the meatloaf.
Bake for 40 minutes, or until juices run clear.