Spread the sugar in a shallow dish
Peel, core and slice the pineapple into rounds, spears, chunks or whatever shape you desire. Dip both sides of each slice of pineapple into the sugar. The less ripe the pineapple, the heavier the coat of sugar (for a very ripe pineapple a very light sprinkle of sugar is all that’s needed)
Arrange the pineapple in a single layer in a large heavy pan and place over medium-high heat (or on a grill*) Cook about 5-8 minutes until caramelized then flip and carmelize on the other side.
When both sides are golden take off the heat and serve.