For a vegetarian version, omit the halloumi or substitute with grilled tofu. Add a handful of fresh arugula or spinach for extra greens. To make the honey-mustard dressing from scratch, whisk together 2 tablespoons Dijon mustard, 1 tablespoon honey, 1 tablespoon olive oil, and a squeeze of lemon juice. Roasting the butternut squash brings out its natural sweetness.