Spinach Salad with Steak and Blueberries Recipe

Ingredients

• 1 cup fresh blueberries, divided
• 1/2 cup chopped walnuts, toasted (see Tips)
• 3 tablespoons fruity vinegar, such as raspberry vinegar
• 1 tablespoon minced shallot
• 1 teaspoon sugar
• 1/2 teaspoon salt, divided
• 3 tablespoons walnut oil or canola oil
• 1 pound (1-1 1/4 inches thick) sirloin steak or strip steak, trimmed
• 1/2 teaspoon freshly ground pepper
• 8 cups baby spinach
• 1/4 cup crumbled feta cheese