Rustic Crust, maker of all-natural ready-made pizza crusts, has a new angle when it comes to pizza geometrics. Its new Big Slice—available exclusively at 2,400 Walmarts nationwide—is literally a giant pizza slice, more than 15 inches long and triangular. Made with all-natural premium ingredients—no artificial colors, flavors or preservatives—the Big Slice is handcrafted and wood-fired. […]