Start with blooming saffron threads in warm water or wine.
On the other side, sauté chopped garlic and onions or shallots in a pan. Sauté them in olive oil or butter.
Add white wine into the pan and let everything simmer for 2 to 3 minutes.
Pour in the fish stock or vegetable broth and bloomed saffron with liquid. Then let everything simmer for a bit.
Add cream into the sauce and let the sauce simmer again for 8 to 10 minutes. Stir the sauce occasionally, and it will turn thick.
Lastly, add salt, lemon juice, and black pepper, stir again, and serve immediately.