Peel Potatoes and place in a bowl of cool water and set aside.
In a large mixing bowl, mix together all ingredients, except Potatoes, Diced Tomatoes and Sugar.
Using an immersion blender, blend the diced tomatoes and add half to the meat mixture and mix together and set aside the rest to make the Meatloaf Sauce.
Form the meatloaf into a tall oval shape and place on Steam Rack.
Add 2 cups of water into cooking pot and place a Short Legged Trivet into cooking pot. Lay whole Potatoes in a single row on top. Place the Steam Rack on top of the potatoes.
Lock lid in place and close Pressure Valve. Cook at High Pressure for 20 minutes. When Beep sounds, wait 10 minutes and then release the rest of the pressure.
To make Meatloaf Sauce, add 2 Tablespoons of Sugar to the blended tomatoes that were set aside and mix well.
Remove Meatloaf from Pressure Cooker and place into oven safe dish. Pour 3/4 of Meatloaf on top of Meatloaf and place under the broiler for 5 minutes. (If you have a CrispLid, set temp to 400 degrees and time to 5 minutes, but keep an eye on it.)