Place tomatoes in boiling water for several seconds, chill in cold water. Peel and halve tomatoes, remove seeds and chop coarsely. Wash and clean zucchini squash and chop into cubes. Drop squash briefly into boiling salt water , then chill in cold water and pat dry with paper towel.
Cut turkey breast Geschnetzeltes-style into thin strips (about 1 inch wide, similar to the way meat is cut for fajitas) and season with salt and pepper.
Sauté briefly over high heat with two tablespoons of rapeseed oil. Remove turkey from pan. Chop green onions and garlic and sauté in the same pan. Add white wine, poultry stock and cream and bring to a boil. Combine corn starch with milk and add to sauce. Add tomatoes, squash and herbs (parsley, basil, chervil). Season to taste with salt and pepper.