Pierce the wood skewers into your sausages all the way to the tip.
Heat the oil in a pot at 140C-150C/285F-300F.
In a bowl, add all of the dry ingredients for the corn dogs and whisk together. Crack the egg in and drizzle in the sparkling water.
Whisk the batter really good, especially for the dairy free version as the egg whites tend to clump together and create flour bumps. When the batter is nice and smooth, dip one sausage at a time and roll the skewer with your fingers so that the batter coats the sausage everywhere evenly.
I suggest frying 1-2 corn dogs at a time and not more.
Add the corn dog into the hot oil to fry. It should only take 30 seconds per side to cook. When you add the corn dog inside the oil, even if you flip them over to cook on the other side, they won't stay and flip back over. So you need to hold them still with tongs so that both sides can cook evenly. This is why I suggest only frying 2 at a time maximum.
When both sides are nice and crispy and golden brown, take them out of the oil and let them cool down on a wire rack. Repeat for the rest of your sausages and your corn dogs are ready!
They reheat well in the microwave, but since they are deep-fried they obviously taste better the same day.