Remove excess water from mozzarella with a paper power and place in the center of your wonton wrapper. Add basil and tomato slice. (Try not to add extra juice from mozzarella or tomato.)
With water, wet the wonton area around the mozzarella. Fold in half by taking the opposite corners and sealing them together, pushing out any air as you go. Now wet the corners and fold them into the middle. Repeat with the rest. TikTok video tutorial here.
Heat a large amount of oil in a pan on medium heat. It should be 350°F. You'll know when it's ready when you place a tester wonton stip in and it bubbles imminently but doesn't brown too quickly. In batches, place your folded wontons in the pan and cook until light brown, about 1-2 minutes. Flip and repeat on the other side.
When they are done, transfer to a cooling rack with a paper towel. Sprinkle with salt. Fry the next batch.
Let cool for a minute or two then enjoy!! They are best eaten fresh.