As Americans, we hold this truth to be self-evident: Not all sandwiches are created equal. Thankfully, Split Bread, the new lunch and dinner spot from the gents behind Mixt Greens, is endowed with 100 percent seasonal produce and all-natural, slow-roasted meats. Ditch your everyday chicken pesto for the No. 21, a porcini-crusted Prime rib-eye sprinkled with Maldon sea salt and topped with Sonoma olive oil on a sourdough baguette. Or the No. 7, a spit-roasted leg of lamb with salsa verde, lemon cucumber, and treviso on a toasted ciabatta roll. Vegetarian and salad dishes come with fresh ingredients (as in no tomatoes in winter). Drinks include eighteen boutique beers and wine by the glass. The best part: It’s cash free. Place your order online in advance, in-store with a card, or at your table by scanning a QR code into your (wicked) smartphone. That’s money, and you know it. Split Bread, 145 4th Street, at Mission Street (415-603-2000 or splitbread.com). Photo: Lucas Fladzinski / Courtesy of William Duff Architects, Inc.