Yes the toast is triangular, however the challenge connection to me is the placement of the objects within your composition. The eye is led from the toast to the coffee to the two jars and back to the toast, forming a triangle. Very good use of negative space as well. The focus seems a little soft and the image could possibly use a little more contrast. 7
Meets the challenge. You don't eat that Marmite stuff do you? An acquired taste to be sure. Focus is a little soft. Composition feels off balance. Subject feels small in the frame. Doesn't hold my interest.