I LOVE grilled pineapple, but I don't like having to get the grill going (we use charcoal) just for that. I was SO happy when I found this recipe for roasted pineapple in the oven. It's by Claire Robinson of 5 Ingredient Fix, you can find the entire recipe here (she pairs it with shaved ginger ale for a yummy dessert).
Start with a fresh pineapple. Cut off the top and outside, then slice it into 8 slices (don't bother coring it at this point). Place the slices on a cookie sheet.
Brush both sides of each slice with Vegetable Oil (I used Canola Oil) - don't use too much or they'll be soggy! Then sprinkle the side that is up with sugar and salt (not too much salt, but it helps bring out the pineapple's juices).
Cook in a 400* oven for 20 minutes, turn, sprinkle with sugar and salt and cook for 10 more minutes.
Mmmmm! These are a really good side with steak.