Choose cornstarch when that is the ingredient the recipe requires. Do not use this entry for cornmeal, a flour blend, or another starch simply because the names or intended tasks seem similar.
Distinguish the source cups
King Arthur supplies a dry cornstarch source measure. Doves Farm supplies a cup reference with an explicit physical volume of 240 mL. BatchLadle keeps that publisher’s 240 mL cup distinct from the exact US customary cup.
The Doves Farm page does not specify a detailed filling or packing procedure for this row. Its volume definition is useful, but the method limitation remains part of the result.
Measure the dry ingredient
The ingredient amount refers to cornstarch itself. If a recipe later mixes it with liquid, keep the liquid as a separate row rather than treating the combined mixture as dry cornstarch.
For a recipe that supplies grams, scale those grams directly. There is no need to infer how the dry ingredient would fit into a cup.
Inspect small scaled portions
Cornstarch may appear as a small spoon quantity. After scaling, inspect the unrounded result and choose a readable fraction or decimal without replacing the original value.
Keep any instruction about mixing or adding it in the recipe notes. A conversion changes the amount’s representation, not the method or a recipe’s substitution rules.