Place the pineapple slices on a sheet tray. Season with chili powder on both sides.
Broil or grill for 3-4 minutes on each side or until slightly charred. Remove from oven when done and let it cool. Once cooled, dice them into chunks and set aside.
Chop the onions, jalapenos, and cilantro. Add to a mortar and pestle or bowl and smash together to release some of the juices.
Cut each avocado in half and remove the pits. Scoop the flesh of the avocados into a bowl and mash into desired consistency. I prefer to mine chunky.
Add the smashed onions jalapenos, cilantro and juice of 2 limes. Season with salt and pepper to taste.
Mix in 3/4 of the pineapple chunks. Place the rest of the pinepple on top of the finished guacamole.
Serve with your favorite chips and enjoy!