"What's for dinner?" is one question that can be a little trickier to answer on Meatless Monday. Take a cue from supermodel Heidi Klum. She may be German but this international catwalker knows how to whip up South of the Border fare her kids go bananas for. Think tacos, cactus salad, and fresh salsa. But as any foodie can attest, authentic Mexican dishes all come down to one key element: the guac. Luckily, Klum has a zesty go-to guacamole recipe that's a real people-pleaser. Our favorite part: It only takes ten minutes of prep time. Any questions?