Matt wants to know how it's possible for British onions to be sold in supermarkets year-round. The answer lies not in our soil, but in an aircraft hangar. Plus: is pricey aged steak worth the wait?

Why is farmed salmon pink? Can you grow a chicken as big as a turkey? Is the gold in drinks real gold? Can you eat frankincense? How do they make wafer-thin after-dinner mints?