You can bake potatoes directly on the oven rack, or you can place them a few inches apart on a foil -lined baking sheet. Bake potatoes at 350 for 50-60 minutes.
Flip every 20 minutes or so and check for doneness by piercing with a fork.
Brown the ground beef in a large pan over medium/high heat while breaking up the pieces - add the onion, and celery during cooking time. Drain excess grease.
Reduce heat to medium and add the green pepper, vinegar, dijon mustard, garlic, dried parsley, and salt. Combine well.
Meanwhile, in a small pot, bring ⅔ cup water to a boil and add the dates.
Boil for a couple of minutes, just long enough to significantly soften the dates.
Place the dates into a food processor or blender, then add tomato sauce, and tomato paste.
Blend well then add to the beef mixture - stir to warm.
Serve sloppy joe mixture on top of baked potato and garnish with green onions.