This recipe for flank steak crostini is a delicious and elegant way to prepare this cut of meat. Using a food processor to make the marinade is a great way to ensure that all the ingredients are evenly distributed throughout the steak. The marinade is made with olive oil, garlic, rosemary, and other spices, which infuse the steak with a ton of flavor. Once the steak is marinated, it's grilled to perfection and served on top of toasted baguette slices with a side of homemade aioli. This dish is perfect for a fancy dinner party or a special occasion.