d1 is/are teaspoon(s) [measuring instrument] containing/holding/enclosing v2, of volume d2 (default 1)teaspoon(s)/teaspoonful(s) [volume-unit], standard d3=m1 (default 1=5 mL).
Teaspoon (measuring instrument) doesn't need to have the shape/form of a spoon. See also: teaspoon (measuring unit;=mucyxeldekpu). Containment x2 need not be total.