My in-laws are coming over on Saturday for my father-in-law's 70th birthday. He is totally carb free. We're going to grill flank steaks with chimichurri and some other type of protein, probably chicken for my super picky sister-in-law, then strawberries with balsamic vinegar for dessert. I am tapped out on side dishes. Any suggestions besides the same boring grilled squash and zucchini I always make for him?