If it’s meat, looks like Rocky Mountain Oysters. Thought of this fine community the instant I saw it. Your guess is as good as mine. OP stated, ‘Good God !!! Please don’t tell me they’re some animal’s kidneys - that’s going too far , pizza explorers…… baaarf!!!’.
Margherita al foetus
🎶 foetus in the morning, foetus in the evening, foetus at supper time… 🎶