Put zucchini into a large kettle and add lemon peel, lemon juice, and pineapple. Bring ingredients to a boil over high heat. Lower heat and continue to simmer, uncovered, until zucchini is tender. Add pectin. Bring to a boil again, and stir in the sugar and ginger. Boil hard for 1 minute, stirring constantly. Remove from heat and skim off foam. Stir for 5 minutes to prevent zucchini from floating. Ladle into sterilized jelly jars, and seal with 1⁄4 inch of paraffin.