Balsamic Beef & Sweet Potato Mash Clean Eating Recipe

black pepper120 g sirloin steak, lean2 sprigs fresh chives0.5 tsp garlic, minced1 sweet potato (approx 150g each)30 mls balsamic vinegar20 mls coconut milk, reduced fat1 cup mixed salad leaves4 cherry tomatoes, small (approx 10g each)