.75oz Campari
.5oz Demerara Syrup
1.5oz Pineapple Juice
.5oz Lime Juice
Shake with ice and serve in an old fashioned glass with crushed ice. Garnish with a pineapple wedge or fronds if you have a pineapple lying around. An umbrella will also do the trick.
Dole's canned pineapple juice works great for cocktails, don't bother with fresh pineapple juice.