Spiced Grilled Chicken with Cauliflower Rice Tabbouleh

Name: Spiced Grilled Chicken with Cauliflower Rice Tabbouleh
Ingredients: 5 tablespoons extra-virgin olive oil, divided; 2 ½ teaspoons ground cumin, divided; 1 ½ teaspoons dried marjoram; ¾ teaspoon salt, divided; ¼ teaspoon ground allspice; ¼ teaspoon cayenne pepper; 1 pound boneless, skinless chicken breast, trimmed; ¼ cup lemon juice; 2 cups fresh riced cauliflower (see Tip); 2 cups flat-leaf parsley leaves; 1 cup diced cucumber; 1 cup halved cherry tomatoes; ¼ cup sliced scallions