Which preposition to use with dessertspoonfuls

of Occurrences 58%

Season with salt and a dessertspoonful of curry-powder.

at Occurrences 2%

Triturate till the oil is incorporated, then add slowly Mint-water One ounce and a half Laudanum Ten drops Half a teaspoonful three times a day, to an infant from one to two years old; a teaspoonful from two to three years old; and a dessertspoonful at any age over that time.

to Occurrences 1%

If fruit is to be used, it should be washed and dried according to directions given on page 298, and then dusted with flour, a dessertspoonful to the pound of fruit.

Which preposition to use with  dessertspoonfuls