Peel onion, cut in half, then slice into thin strips. Wash zucchini, quarter lengthways, then cut into small pieces. Clean mushrooms, halve them, then slice. Chop fresh mint.
Heat roughly 2-3 tablespoons of olive oil in a large pan over medium-high heat. Add onions and sauté for 3-4 minutes until translucent. Add seasoned pork and cook for 5-7 minutes until browned and cooked through (internal temperature 63°C / 145°F). Deglaze with Metaxa and let reduce for 5-10 minutes.
Add zucchini, mushrooms, and garlic. Add a splash of water if necessary. Simmer over medium heat for 5 minutes.
Stir in yogurt, tomato paste, oregano, cinnamon, and feta cheese. Simmer for 2-3 minutes until feta melts and sauce is well combined. Season with salt and pepper.