Living in Argentina during high school, I ate dulce de membrillo many times before I had a clue what the sugary, dark orange paste was. I later learned that membrillo is Spanish for 'quince,' and dulce de membrillo (literally, 'quince sweet') is simply a dense quince jelly.
The quince, which resembles an overgrown chartreuse pear, is a fruit native to Asia, now grown all over the world. Unlike pears, however, quince are not eaten raw (I've tried - they're sour and astringent and hard as rocks).
In Spain and Argentina, dulce de membrillo is sold by the slice from massive bricks and generally served with nutty, salty Manchego cheese or on buttered toast. I've also run across it in Israel, served for breakfast with thick, sour yogurt. Here in the US, you can find it at Spanish specialty stores, and some Hispanic markets and regular gourmet shops. It's got an interesting grainy texture and a somewhat floral, apple-like flavor. It's quite sweet - sweeter than most jams and jellies - which is why it's so good paired with cheese or plain yogurt. Try it with slices of Manchego on crackers, or slip some inside a wheel of brie and bake until gooey.
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