Process the onion in a food processor for 10 - 15 seconds and turn out into the center of a tea towel. Squeeze out juice, discard juice.
Add ground pork, onion, garlic, marjoram, spice blend, rosemary salt and pepper. Process until it is a fine paste.
Preheat oven to 325.
Place mixture into a greased loaf pan, making sure to press into the sides of the pan.
Place loaf pan into a water bath and bake for 60 - 70 minutes or until the mixture reaches 165 degrees center.
Remove from the oven and drain off fat.
Place the loaf pan on a cooling rack and place a brick wrapped in aluminum foil directly on the surface of the meat. Allow to sit for 15-20 minutes.
Slice and serve on pita bread with Tzatziki sauce, chopped onion, tomatoes and feta cheese.