Three bean salad, that isn't exactly three bean

I wanted to make three bean salad today, but two grocery stores did not have wax beans.

So I substituted canned beets, making it a two bean salad with beets.

The recipe calls for 2 cans of cut green beans, 2 cans of wax beans, 2 cans of red kidney beans, 1 can of sweetened condensed milk, 1/4 cup mustard, 1 cup sour cream, chopped cooked onions, lemon juice.

Cook the onions in a cast iron skillet or griddle before adding to the salad.