At work today the subject of books from our childhood and the following came up by two of us, we both remember the book, but are at a total loss as to the title.
Here’s what we know (or think we know):
We read it in elementary school and/or Junior High School, in any case, the early to mid 90s.
The cover featured a triangular shaped portal/hole. In the hole was a dragon’s eye, surrounded by mist, and a dragons claw poking out of the hole.
It was about a boy who found a knife with a black blade engraved with a triangle. The knife had some odd properties to it:
He peeled a potato with the knife and it became rock solid.
He peeled a slice of potato and it, too, became rock solid, and became a “glowing disk of death” (my own words) when thrown
Cutting a triangular shaped hole in above mentioned potato slice allowed him to see into another world.
The boy finds a refrigerator box, which he cuts a similar triangle shaped hole, when he steps through it he enters another world.
Dragons steal the piece of cardboard covering the hole, allowing them to invade this world. it’s revealed that due to him carrying this knife he’s some kind of dragon slayer.
Other than that, I remember that the book was fairly violent, including one scene featuring the boy ripping a dragons gut open with his knife as it flies overhead.
Google, wikipedia, numerous publisher sites have turned up blank. Are we suffering from a mass hallucination.