In a large pan
, heat the 1 Tbsp of olive oil on medium heat until shiny. Add in the sliced onions. and a pinch of salt and stir until they are coated in the oil. Cook, stirring every so often, until the onions are caramelized and golden brown, 30-45 minutes. If you have a very hot stove, you may need to turn the heat to medium low, as you don't want them to burn. Don't stir too often, as you want the bottom to caramelize properly.