Beat eggs for at least three minutes, or until they are light, fluffy, and doubled in volume. This gives the pizzelle a light texture and makes the batter much easier to work with.
Gradually beat in erythritol on low speed, then beat in oil, lemon zest, and vanilla extract.
Mix in the Keto Chow and salt.
Let the batter rest while you heat your pizzelle iron.
When your iron is heated, drop about a Tbsp.-size ball of dough onto your iron. For best results, drop it slightly nearer the back of the iron because it will be pushed toward the front as you close it.
Cook according to the manufacturer’s directions. When the pizzelle is done, it should be lightly golden, but not brown. Depending on the iron, this could take 20 seconds to 2 minutes.
Gently remove the cooked pizzelle from the iron with a small spatula. It will be very soft, but it will crisp as it cools. Lay the cooked pizzelles in a single layer on a rack to cool. Use a pair of kitchen shears to trim the edges, if desired. While they are still warm, they can be shaped by draping over a small cup or wrapping them around a cannoli form.
When they are cool, stack them in a box or tin that isn’t completely airtight (so they stay crisp). If needed, they can be re-crisped at a low temperature in the oven.
Dust with powdered sweetener for a decorative touch.