Final answer:
The phrase 'too hot to eat' fits best with option 2, suggesting John enjoys the pancakes despite their temperature.
Step-by-step explanation:
The phrase 'too hot to eat' can be correctly added to the sentence about John enjoying the pancakes with the option 2) even though they are too hot. Therefore, the complete sentence would be: "John will enjoy the pancakes even though they are too hot." This addition conveys that John will enjoy the pancakes despite their high temperature, implying his appreciation for the food outweighs any discomfort from the heat.