Prepare the Celery: Wash the celery stalk thoroughly under cold water and pat dry.
Slice the stalk on the diagonal into roughly 1-inch pieces.
Combine the Base: In a small mixing bowl, combine the sliced celery with the 1 cup (240 ml) of chopped apple and the 1/3 cup (720 ml) of walnut pieces.
Add the Dressing: Spoon the 2 tbsp (30 ml) of vanilla Greek yogurt over the fruit and nut mixture.
Toss gently until the are evenly coated.
Serve or Store: Plate the salad and serve immediately to enjoy the texture at its crispest, or cover and chill for 20 minutes before serving.
Chill Your : For the most refreshing bite, ensure your yogurt and apples are cold right out of the fridge before mixing.