Apple and Spinach Salad

2 Tbsp fresh lime juice
2 Tbsp fresh orange juice
2 tsp Dijon mustard
2 tsp honey
1/4 tsp salt
freshly ground black pepper to taste
1/2 cup thinly sliced red onion
8 cups fresh baby spinach (about 8 ounces)
1 large apple, cored and thinly sliced
1/4 cup (1 ounce) crumbled blue cheese
Combine juices, mustard, honey, salt and pepper in a small bowl and whisk together. Place onions and spinach in a large bowl. Add dressing and toss together. Top with blue cheese.