Three Bean Salad

Ingredients

• * 1 1/4 cups white sugar
• * 3 teaspoons cornstarch
• * 1/2 teaspoon salt
• * 1 teaspoon ground dry mustard
• * 1 1/4 cups water
• * 1/2 cup cider vinegar
• * 1 (14.5 ounce) can green beans, drained
• * 1 (14.5 ounce) can wax beans, drained
• * 1 (15.25 ounce) can red kidney beans, drained
• * 1/2 cup finely chopped onion
• * 1/2 cup finely chopped green bell pepper