Remove skin and seeds from white grapes. If grapes are firm, boiling water may be poured over them and allowed to stand 1 minute, when skins will come off easily.
Pare oranges, removing white part with the skin, and remove sections free from membrane.
Cut pineapple in dice. Mix the fruit with sugar, lemon juice, orange juice, syrup from canned pineapple, and salt. Put into ice cream freezer, surround with ice and salt, and stir occasionally until juice begins to freeze. Serve in cocktail glasses, garnishing each glass with a maraschino cherry.