Hamburger

Cheese or plain (on burger)

Cheese! 
 

Ketchup or catsup 

Ketchup and Mustard by Heinz 

Hamburger - open faced or sandwich

Sandwich

Onion, Tomato, & Lettuce or plain.

On Catsup, I remember my sister seeing Catsup in the store and writing to Del Monte that they are teaching children to misspell words. I told her she would be added to the crank list.

That’s funny that she wrote them! No reply?

yes, onion, tomatoes, and lettuce. Pickles too! 
 

Onion on burger: raw or cooked

Raw
burger - grilled or fried

Grilled

 burger: turkey or beef

Beef

Fruit or vegetable salad?

Vegetable 

In salad: beets or no

No. Beets are one of my least favorite foods. Just the look makes me dislike them. 

Salad before or with the main course.

Regarding Catsup, she did get a reply. Something about making their nutritional product fun for children and encouraging them to eat healthy. When her children were young, she would correct the grammar and punctuation on their essays or tests. They would respond, but the teacher didn't say that. Eventually they stopped showing her.