Adjust oven rack to middle position; heat oven to 375 degrees. Prepare by putting foil on cookie sheet. Dump all meat in a large mixing bowl. Chop parsley and add to meat.

Heat olive ol in skillet over high heat; add onion and cook, stirring occasionally, until beginning to brown, 6 to 8 minutes. Add garlic, thyme, and paprika and cook, stirring, until fragrant, about 1 minute. Set aside to cool. Then add to meat.

Whisk eggs in large bowl until combined. Sprinkle gelatin over liquid and let stand 5 minutes. Stir in soy sauce, mustard, Worcestershire sauce, salt, pepper. Add to meat. Mix gently with hands until thoroughly combined, about 1 minute. Form three equal sized loafs and place on foil lined cookie sheet. Bake until an instant-read thermometer inserted into center of loaf reads 135 to 140 degrees, 55 to 65 minutes. Remove meat loaf from oven and turn on broiler.

While meat loaf cooks, combine ingredients for glaze in small saucepan; bring to simmer over medium heat and cook, stirring, until thick and syrupy, about 5 minutes. Spread half of glaze evenly over cooked meat loaf with rubber spatula; place under broiler and cook until glaze bubbles and begins to brown at edges, about 5 minutes. Remove meat loaf from oven and spread evenly with remaining glaze; place back under broiler and cook until glaze is again bubbling and beginning to brown, about 5 minutes more. Let meat loaf cool about 20 minutes before slicing.

Optional: Ground chipotle chile flakes Ground celery seed horseradish