Although you can toast nuts in the oven, I prefer toasting them in a dry skillet because it's easier to control the heat and they are less likely to burn. Add sliced almonds to a dry skillet on the stovetop in a single layer. Heat over medium-low to medium heat. Shake/stir the nuts periodically to ensure they toast evenly and down brown too quickly (you'll smell the nutty aroma). Remove from the skillet to a plate and cool before using to garnish.