These Grilled Shrimp Tostados with Mashed Black Beans and Avocado Salsa Fresca from The Ultimate Panini Press Cookbook are sure to make dinnertime something to look forward to. Recently, I received a review copy of my friend, Kathy Strah’s, new cookbook, The Ultimate Panini Press Cookbook. I started following Kathy’s blog, Panini Happy, when I…