In a casserole, heat olive oil at medium high heat. Brown meat cubes lightly in oil with leeks and garlic for about 7 minutes.
Afterward, add white wine, thyme and cayenne. Reduce 5 minutes. Add cream, slightly lower heat and reduce 5 minutes. Add spinaches to the sauce, mix a bit and cook spinaches 2 minutes.
Add parmesan cheese and cook 2 minutes. Add salt and pepper up to taste.
Cook pastas with package's indications. Set sauce over pastas and serve.
Chef’s note
If the sauce is too liquid, add a tablespoon of flour mized with 1/4 cup of warm water and cook 5 more minutes and stir often.