To toast nuts, such as peeled almonds, put them in a frying pan without any fat and toss or turn them over medium heat until they are pale brown. Tip out immediately onto a plate. If you leave them in the pan they will continue to cook. If you are toasting masses of nuts, do them in a medium oven, spread out on a baking tray. But be very careful: after 5 minutes, check every minute and turn them sides to middle to stop some browning more quickly than others. Nuts can burn in a flash. I can’t tell you how many I’ve lost that way over the years. Maddening and expensive!