I'm chopping an onion for the tomato and beef ragu and shouting happily to Ruth: 'This and a bit of olive oil are the only things in this entire meal that were bought!' But she sniffs and says: 'Have you really thought through the ethics of this?'--Guardian UKCaveat: This post is really a thinly hidden pointer to a heated discussion I'm having with a writer at Brave New Traveler.