Before You Begin
Prepare your ingredients and tools as needed. Results may vary depending on your ingredients. Wash and dry all produce thoroughly. Do not leave prepared food at room temperature for more than 2 hours.
Prepare Produce
Wash spinach thoroughly and dry completely. Slice strawberries and onion thinly.
Make Dressing
In a bowl, whisk olive oil, vinegar, honey, mustard (if using), poppy seeds, salt, and pepper until smooth and fully combined. Refrigerate until ready to use.
Assemble Salad
Place spinach, strawberries, onion, cheese, and nuts in a large bowl. Keep undressed until serving to maintain crisp texture.
Dress and Toss
Pour dressing over salad immediately before serving. Toss gently until evenly coated and leaves appear lightly glossy.
Serve
Serve immediately for best freshness and texture. Refrigerate leftovers promptly.