6 medium cloves garlic 1/4 cup (60 ml) freshly squeezed orange juice (from about 1 orange) 1/4 cup (60 ml) freshly squeezed lime juice (from about 2 limes) 1 1/2 teaspoons ground cumin 1 1/2 teaspoons dried oregano 1 teaspoon freshly ground black pepper 1/2 teaspoon ground allspice (optional) Kosher salt 4 boneless, skinless chicken breast halves (about 10 ounces; 285 g each) or 8 chicken cutlets 1 tablespoon (15 ml) neutral oil such as canola or vegetable, plus more as neede