Heat a large pan over medium-high heat. Add the 1 ¼ kg gyros meat and cook for 8-10 minutes, breaking it apart with a spoon, until the edges are browned.
Stir in the 3 cups cream until well combined.
Transfer the mixture to a large baking dish or pot, cover, and refrigerate overnight (at least 8 hours).
The next day, add the chili sauce (1 bottle), Mexico vegetables (2 cans), gypsy sauce (1 glass / 250 g), and 3 packs onion soup. Stir well to combine.
Cover and bake in the oven at 200°C (392°F) for 1 hour 30 minutes to 2 hours.