Pour 1 Tbsp. olive oil in 12 by 15 inch baking pan; add asparagus pieces, sprinkle with salt, mix to coat. Spread in single layer and bake at 400 degrees, stirring often, for 15 - 20 minutes. Let cool.
In a large bowl, combine vinegar, 2 Tbsp. olive oil. Add spinach, strawberries, walnuts and cooled asparagus. Mix to coat. Add salt and pepper to taste.