Garden expert Ute Studer reveals what's going on. Spain's Prime Minister Pedro Sánchez counters that Royal has never tried a Spanish tomato.

Studer: I suspect it's about market shares and EU subsidies, rather than taste. As far as Italian canned food is concerned, 80 percent now comes from China. The tomatoes are grown and canned in China, then they are canned in Italy and marketed as Italian. It doesn't matter whether the tomatoes are called ox heart, cœur de bœuf.