Directions

1. Preheat grill to medium.
2. Pulse 1/4 cup blueberries, 1/4 cup walnuts, vinegar, shallot, sugar and 1/4 teaspoon salt in a food processor to form a chunky paste. With the motor running, add oil until incorporated. Transfer the dressing to a large bowl.
3. Sprinkle steak with pepper and the remaining 1/4 teaspoon salt. Oil the grill rack. Grill the steak about 5 minutes per side for medium-rare, 6 minutes per side for medium. Let rest on a clean cutting board for 5 minutes.
4. Add spinach to the bowl with the dressing; toss to coat. Divide the spinach among 4 plates. Thinly slice the steak crosswise. Top the spinach with the steak, feta and the remaining blueberries and walnuts.

Tips

• Tip: To oil a grill rack, oil a folded paper towel, hold it with tongs and rub it over the rack. (Do not use cooking spray on a hot grill.)
• Tip: To toast chopped nuts, place in a small dry skillet and cook over medium-low heat, stirring constantly, until fragrant and lightly browned, 2 to 4 minutes.