How can I bake something delicious?

Hint 1 of 7:

Take a look at that big black rock.

Hint 2 of 7:

It is very hot.

Hint 3 of 7:

Combine 3 ingredients: corn, thyme, fruit.

Hint 4 of 7:

You now have a raw corn muffin.

Hint 5 of 7:

Use the muffin on the obsidian rock to make it.

Hint 6 of 7:

I never found an actual use for the muffin other than eating it.