Apparently, a one-quarter-pound beef patty, sandwiched in a four-inch-diameter bread product, and made at home, qualifies as a "mini" hamburger.
I know where to get a mini hamburger, and a quarter-pounder is not mini.
(By the way, I googled around to find the pre-cooked weight of a White Castle patty, and I got to this Wikianswers page where the first user wrote "0.70 ounces," and that had been (ostensibly) corrected by a second user who wrote "Actually, it is 2 ounces." Well, 2 ounces (58 g) is the weight of the whole damn hamburger, cooked and with bun, and I think that’s where the second user got that figure. I added a note to Wikianswers. Probably should have gone to the discussion page, but what the heck.)
Where was I?
Oh yes. Maybe the recipe writer was influenced by Thomas’ recent introduction of "Sandwich Size" English muffins. What? The old English muffins were too small for a sandwich? (Astonishingly, there’s no nutrition info on the website. Losers.) I’ve been making hamburgers on whole-grain English muffins for a long time — it’s easier to find whole-wheat English muffins than whole-wheat hamburger buns.