PREP: 15 minutes COOK: 6 to 8 hours (low) or 3 to 4 hours (high) STAND: 5 minutes MAKES 6 servings Nonstick cooking spray 3 14.5-ounce cans diced tomatoes with basil, garlic, and oregano, undrained 2 14-ounce cans artichoke hearts, drained and quartered 6 cloves...
