The phrase "tsp cornstarch" means to use one teaspoon of cornstarch in a recipe or cooking instruction.
Sentences with «tsp cornstarch»
Heat over medium heat to a light boil and add the corn starch slurry (1 heaping tsp cornstarch to 2 tsp cold water, mixed well to a liquid consistency) slowly, whisking to combine and thicken the sauce. (sublimelysimple.com)