Position the racks to divide the oven into thirds and preheat it to 325° F. Line two baking sheets with parchment paper or silicone baking mats. Have a small cookie scoop or a teaspoon at hand.
Whisk the sugar and egg together in a bowl for a minute or so, until well blended and just a bit thick. Add the almonds and whisk until evenly coated with the mixture. You need to use the batter right away — it separates as it stands. In fact, it’s good to give the batter a stir or two as you’re spooning it out.
Each cookie needs 2 teaspoons of batter. Scoop the batter onto the baking sheets, leaving at least 2 inches of space between the mounds of batter, and flatten each mound with the back of a fork.
To make more pristine shaped cookies for afternoon tea, or gifting you can scoop the batter into silicone muffin cups. This will make removing them easy.
Bake for about 20 minutes, rotating the pans midway through baking. The cookies should be toasted-almond beige, and dry and crackled on top. Transfer the baking sheets to racks and let the cookies cool for about 10 minutes. Carefully lift the free-form cookies with a wide spatula.
Notes
Note: If your kitchen is cool and dry, you can keep these in a tin or paper bag overnight. Keep them longer, and they might soften, a condition easily reversed: Place the cookies on a lined baking sheet and warm them in a 350° F oven for about 6 minutes; cool on the sheet.