Whisk together the mayonnaise, milk, sugar, white vinegar and Poppy seeds for the salad dressing. Wash and dry the baby Spinach leaves well. Place the Spinach leaves in salad bowls. Wash, hull and slice the Strawberries. Place them on top of the Spinach leaves. Sprinkle chopped Red Onions over the salad and drizzle the dressing over the salad. Serve and wait for the yummy reviews. Serves 8.