To make dressing- Place onion in blender and chop. Add sugar, dry mustard, salt and vinegar to onion; blend well. Add salad oil a small amount at a time and blend well after each addition. Pour into jar or container and add poppy seed. Refrigerate. Shake well before pouring over fresh spinach and sliced strawberries.
To make salad- Mix ingredients and pour dressing over salad mix.
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