What did milo eat at the market place in the phantom toolbooth?

Milo and Tock walk around, admiring the "bagful of pronouns" and the "fresh-picked ifs ands, and buts. Milo picks out three very long, elegant words but hastily returns them, when he hears the price. Milo continues looking until he reaches a "DO IT YOURSELF" stall selling all the letters of the alphabet. The seller gives him an "A" to try, and Milo discovers that it tastes sweet and delicious.

The answer is "he was bad enough in all conscience, but the devil himself could not temp him to turn slave-trader. satirical is a synonym for sarcastic. so when the author says that tom walker could not be tempted by the devil he does not literally mean "the devil" but he means that he is too morally upright to become a slave-trader.