Put 2 Tbsp oil into a large skillet and heat over medium.
Dice the onion and the potatoes into small pieces. (The smaller the potatoes the faster they will cook)
Sauté the onions and minced garlic while you are cutting potatoes then add all potatoes at the same time for even cooking.
Season to taste with salt pepper and seasoning salt and add the butter and stir well.
Cover and cook over med heat stirring every 5 minutes or so to keep from burning and sticking.
While potatoes cook brown the hamburger and sausage in a separate pan.
Drain and then while the meat is in the pan make a spot in the middle and pour in the beaten eggs and scramble.
Finally mix the meat together with the eggs and add the potatoes and stir.
There you have it "Gravel".