https://en.wikipedia.org/wiki/A.1._Sauce

I would think it more like HP sauce - not in taste but in function

A-1 contains; TOMATO PUREE (WATER, TOMATO PASTE), DISTILLED VINEGAR, CORN SYRUP, SALT, RAISIN PASTE, CRUSHED ORANGE PUREE, SPICES AND HERBS, DRIED GARLIC AND ONION, CARAMEL COLOR, POTASSIUM SORBATE (TO PRESERVE FRESHNESS), XANTHAN GUM.

HP Sauce contains; Water, Vinegar, Dates, Glucose-Fructose, Black Strap Molasses, Tomato Paste, Modified Cornstarch, Salt, Orange Juice Concentrate, Onion, Spices, Tamarind Extract, Apple Juice Concentrate, Garlic, Chili Peppers, Mustard Flour.