Adobo Flank Steak Tacos
To make ahead: Prepare marinade and sauce (Step 1) and refrigerate for up to 1 day. Marinate steak (Step 2) for up to 12 hours.
Tip: To oil grill rack: Rub an oil-soaked paper towel over the grates (use tongs to hold the paper towel). Do not use cooking spray on a hot grill.