You need yellow potatoes, yellow onions, eggs, salt, olive oil, and salt. A saute pan, a deep pan (stockpot), and a wide plate, wider than the saute pan to turn the tortilla --this is actually the most challenging step. Depending on size of the nonstick saute pan you want to use, measure how many whole potatoes will fit in the pan. Then use about a 1:4 ratio of onions to potatoes. Set the saute pan aside. You will use this later.