Preheat oven to the high broiler setting, place an oven rack on the top rung, and line a baking sheet with foil for easier cleanup, and add the tomatillos, whole garlic cloves, pineapple, and broil on high for 10 minutes.
Remove the baking sheet from the oven, flip over all the ingredients, and return the baking sheet to the oven, and broil for an additional 5 minutes, or until gently charred.
Remove the baking sheet from the oven, transfer the charred ingredients to the canister of a high speed blender or food processor, add the chipotle peppers, and blend on high speed very briefly or pulse a few times, until a chunky consistency is achieved.
Taste the salsa, add salt to taste, stir to combine, and serve.
