The markets are full of summer fruits and when I buy plums this cake is usually the first thing I'll make. Before I left on my trip, we had an extremely cool spring that just wouldn't end. When I was in the south of France I bought myself a wool scarf at the enormous Friday market in Carpentras, and I actually wore it! I never imagined experiencing chilly temperatures along the Mediterranean this time of year. But now that I'm back summer has finally arrived in Minnesota, and I if I do any baking, it is first thing in the morning before my kitchen becomes unbearable. This plum upside-down cake was done just in time for breakfast!