I love Margarita grilled tuna and this is my take on a popular restaurant version made into a salad. Now, you can buy the pre-made tortilla bowls these days at specialty markets or even right in the grocery store; however they are pretty easy to make as well. This takes a few steps but it is well worth it for a very unique salad which you can easily entertain with. Take advantage of making the beans and sour cream the day before to really help save time. This is a great twist on Mexican salad. Save yourself some steps. Make the beans ahead and the sour cream and just put in the fridge. Then just prepare your veggies, make the bowls and grill the tuna which doesn't take any time. Reheat the beans in the microwave and you can put it together in minutes.