Step 1Place the gelatin in a bowl, add the boiling water and stir until dissolved, 1 to 2 minutes. Drain the pineapple, reserving 1/2 cup of the syrup. Add that syrup to the gelatin. Chill until thickened but not set, about 1 hour.
Step 2Fold in the pineapple, cottage cheese, whipped cream, cherries, pecans and marshmallows. Pour into a 5-cup mold. Chill until set, at least 4 hours. Unmold onto a plate.