Spinach Salad with Blood Oranges and Macadamia Nuts Recipe

Ingredients

• 2 red onions, thinly sliced
• 4 blood oranges
• 8 ounces pitted Kalamata olives, drained
• 0.5 cup olive oil
• 6 tablespoons balsamic vinegar, or more to taste
• 1 large navel orange, juiced
• 0.25 cup white sugar
• 2 teaspoons Dijon mustard
• 0.25 teaspoon dried oregano
• 0.25 teaspoon black pepper
• 0.25 teaspoon garlic powder, or more to taste
• 1 (6 ounce) package fresh spinach
• 1 (10 ounce) basket cherry tomatoes, halved
• 4 ounces crumbled blue cheese
• 4 ounces roasted, salted macadamia nuts