The phrase "scant teaspoon" means slightly less than a full teaspoon. It implies using a small amount or not filling the teaspoon completely.
Sentences with «scant teaspoon»
Bring 4 cups water, 2 cups broth, barley, and 1 scant teaspoon sea salt to boil in large pot. (epicurious.com)
I only used 1 scant teaspoon chili flakes but they are really really hot. (whereismyspoon.co)
Spoon 1 scant teaspoon of filling into the centre of the wrapper, then carefully fold the wrapper into a triangle and press the edges to seal. (yummysmells.ca)