How can I get into the city?

Hint 1 of 14:

First of all, have you delivered the letter to the farmer?

Hint 2 of 14:

When you talk to him, he'll tell you something important about the guards.

Hint 3 of 14:

They like sandwiches!

Hint 4 of 14:

Perhaps you can make a sandwich for them.  You have a sandwich spell in your
spell book.

Hint 5 of 14:

There are tricks to getting all of the ingredients to the potion -- those
are covered in other hints in this section.  If you don't know how to find 
any of the items mentioned below, look for other questions that might help.

Hint 6 of 14:

The lettuce can be found in the garden next to the farmer's house.