First, mix dressing then set to the side. You can add to a container to shake for better mixing or using an emulsion blender.
Slice up the strawberry and remove the stems from them.
In a large salad bowl, add the strawberries and spinach into the bowl. Then pour in the dressing and mix it in well with the strawberries and spinach.
Next, fold in the walnut and crumbled feta cheese.
Lastly, add salt and pepper to taste.