The heart only waffles, usually 5 of them in the iron, are a traditional scandinavian dessert.  They irons are still made today and readily available.  The easiest ones to use are the electric, teflon coated ones, Villaware, Cuisinart and others.  If I wanted a reasonably priced, quality cast iron one I would get one made by Jotul, nearly always available on eBay, just search for Jotul (they don't make them anymore, but were made into the 1970s).  Sell for $20 to $40 and are worth it.  These irons have a very short base, like 3/4" high, or can be placed directly on the stove.  The base was optional.
I'll look in the recipe area at what's posted.  I have one for these that is mainly butter and heavy cream with a touch of flour to hold it together.  They are crisp, light, tasty, and a cholesterol nightmare.
tom