Sweet and Sour Greens

5 cups strong-flavored greens (kale, turnip, mustard, leaf broccoli, etc.)
¼ pound of mushrooms, thinly sliced
2 hard cooked eggs, sliced
2 tomatoes, cut into chunks
Sweet and Sour dressing below
Salt and pepper

Sweet and Sour Dressing

¼ cup salad oil
2 tablespoons cider vinegar
2 tablespoons catsup
1 to 2 tablespoons brown sugar
¼ cup thinly sliced green onion