Preheat oven to 350.
Place the potatoes on a baking sheet and drizzle with olive oil, salt and pepper. Bake for about an hour until tender.
Meanwhile, add the beef and onion to a pan and cook for about 10 minutes to brown.
Add in the garlic and cook 1 minute. Add in the tomato paste and cook 2 minutes, stirring often.
Add in the remaining ingredients and stir to combine. Cover and cook, stirring occasionally, until the potatoes are ready.
Slice the potatoes in half and place the bottom halves on each plate. Top with a large scoop of the sloppy joe mixture, then place the top half of the tomato on top. Serve.