Light a barrel fire and wait for pizza to come to you.
Well, when in Rome and so on. You gather some dirty rags, old newspapers, and plastic bottles from around into a rusty metal barrel and start a fire to keep warm while you wait for pizza.
The wait is a long one. The minutes turn into hours and days. You were already hungry enough to eat a pizza, but each cold empty night widens the chasm in your stomach. A hungry rat limps by, echoing your worries. You two aren't really in the same position, though, are you?
Catch and eat the rat. Look for something else to eat.