This recipe is absolutely unique. It comes from Ann Wright. She never told me if she invented this recipe or where she got it. What sets it apart is the pineapple sauce. You wouldn't think that tomatoes and pineapple would go together, but they do.
In a large bowl, dissolve the Jell-O in the boiling water, stirring for a minute. Add the tomatoes, onion, tomato puree, and tomato juice and mix until the aspic is well combined. Pour the mixture into a lightly greased 1-quart mold or 8-inch square glass dish. Refrigerate, lightly covered, overnight. To remove from the mold, briefly* dip it into a bowl of hot water and unmold onto a chilled plate.
To make the sauce, in a small bowl, whisk together the lemon juice, mayonnaise, and pineapple juice. Add the crushed pineapple and stir lightly with a fork. Cover with plastic wrap and serve at room temperature with the aspic.
*Briefly means about 10 seconds. If the aspic doesn't come out of the mold the first time, dip it again for 5 seconds. Have patience.