Begin by selecting your salad vessel—small lettuce leaves or endives. Rinse them thoroughly under cold water, then pat them dry with a clean kitchen towel.

In a large mixing bowl, combine fresh spinach with sliced strawberries, crumbled feta cheese, and chopped walnuts. Gently mix to distribute colors evenly.

In a separate bowl, whisk together balsamic vinegar, olive oil, a pinch of salt, and freshly cracked pepper until smooth.

Drizzle the dressing over the spinach and strawberry mixture. Gently toss everything together.

Carefully scoop the salad mixture into the prepared salad cups and arrange on a serving platter.