Similar to jelly and jam, pineapple preserves are a type of condiment made with pineapple. Unlike jelly, which uses fruit juice, and jam, which uses fruit pulp, preserves are made with actual fruit pieces, and so are chunkier than the other alternatives.he simplest versions of pineapple preserves use just pineapple and sugar. Either fresh or canned pineapple can be used, but the juice should be preserved from both. If canned, the pineapple is usually crushed, whereas fresh pineapple is cut into small cubes.