Add olive oil, vinegar, dijon, salt, and pepper to a small jar with lid. Shake until well combined.
Taste, then adjust seasoning with additional salt and pepper, if needed. Set aside.
Prepare Salad:
Transfer greens (plus any ingredients you'd like to mix in) to a large bowl.
Drizzle salad lightly with dressing, then toss gently. Add more dressing while mixing, if needed, using just enough to lightly coat greens and veggies (you will have leftovers).
Taste salad, then add a pinch of salt and pepper, if needed.
Add toppings (if using), then serve immediately. Enjoy!
Notes
Dressing - If you make multiple salads over the course of a week, prepare the full-size recipe of this Red Wine Vinaigrette and store it in your fridge. You could also make this salad with my Lemon Olive Oil Dressing or Maple Vinaigrette, or choose your favorite dressing, such an Italian, Greek, or French vinaigrette, blue cheese dressing, ranch, thousand island, etc.Lettuce - I used mixed greens (a mesclun / spring mix) this time, but different greens will also work. Try butter lettuce, red or green leaf lettuce, romaine, baby kale, spinach, arugula, even iceberg. You could also toss in some bitter greens, such as radicchio or endive.Toppings - You can serve this salad plain (dressing + greens) or add whatever toppings you'd like. I kept things simple and added some shaved parmesan, but veggies, cheese, croutons, and more are welcome additions. Mix larger toppings in with the lettuce as you toss the salad, and sprinkle crunchy croutons or smaller toppings (like nuts) over the top.More Tips - Check out all the info before this recipe for lots of helpful tips, plus tons of topping ideas!