Officer Bill Gannon's "Top Secret" Barbecue Sauce Recipe

This recipe is from the 1968 Dragnet television series episode "The Big High." I've never tested it, so I can't vouch whether this recipe is legitimate or farce.

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Officer Bill Gannon's "Top Secret" Barbecue Sauce Recipe

Ingredient list:
1 quart ketchup
1 can red pepper (might he mean this kind?)
1 can hot mustard
1 quart vinegar
1 pound peeled chopped red peppers
1 small jar oregano
4-5 big cloves of fresh garlic
5 chopped bermuda onions
1 quart vanilla ice cream*

Instructions:
Chill a bowl large enough to hold the above listed ingredients.
With electric mixer, mix the ketchup. Add red pepper, hot mustard, vinegar, chopped red peppers, oregano, and garlic.
Mix well, continue mixing, add bermuda onions and vanilla ice cream.

*Gives it that "hard to tell what's in it" flavor.