When a friend and her daughter came for a visit toting a plate of rhubarb and strawberry bars, you'd have thought that my son would have had a little more tact before digging in and stuffing his mouth with three pieces at once and proclaiming in a tone loud enough for the neighbors to hear "Wow mom, these are amazing! What is this stuff? Why don't you ever make something with this rhubarb gunk in it?"I don't really care that rhubarb is a vegetable that acts like a fruit, because no matter how you serve it, it's always a treat. It's available year-round in the freezer section, but it's best in the spring, when it's one of the first veggies of the season.Lightly salt the pineapple slices and chicken thighs; season chicken with pepper to taste. Place them on the grill over direct heat; close the lid. When the pineapple has good grill marks on one side (5 to 6 minutes), turn the pieces and move to the indirect-heat side of the grill.