Winter is the best time for shellfish here on the West Coast, especially for mussels. Our mussels become toxic in the warmer months, and even the clams can get iffy in summer. So I find myself cooking this Sardinian soup between Thanksgiving and April, when our mussel quarantine begins.
Now this soup does not necessarily have to be a hearty winter warmer, but it definitely fits the bill — I’ve also made lighter, summertime versions of it substituting tomato for the roasted red pepper and easing back a bit on the pasta. Either way, this is an Italian classic.
Sardinian classic, really. And many Sardinians will make this distinction, noting that they were not part of greater Italy until quite recently. Their name for this soup is fregula kin arsellas, which is basically fregula pasta with baby clams. My recipe is loosely based on one I found in Efisio Harris’ Sweet Myrtle and Bitter Honey, one of the few books on Sardinian cooking written in English.
Traditionally this Sardinian soup is make with baby clams, so use them if you can get them. I use Western littlenecks, which are actually a kind of cockle, but Eastern littlenecks and Manila clams work great, too.
If you make this a mussel soup, it’s not traditional but is delicious. I also switch out the tomatoes in the classic version for fire-roasted red peppers, which are more of a winter ingredient for me.
My secrets to this dish are three:
- Some of the “water” in the broth is seawater, which I boil first and then strain to rid it of impurities. Seawater makes this soup powerful, briny and achingly perfect for a crisp Vermentino, one of Sardinia’s best white wines. If you aren’t near the ocean, remember to salt your water liberally.
- I add sea beans, a/k/a salicornia or glasswort. It’s a crunchy, green succulent plant that grows on seashores worldwide.
- And I often will toss in a few smoked mussels, just for accent. It really adds a lot to the dish.
While you need not do any of the special things I do to make this Sardinian soup, you really do need some sort of small pasta, ideally fregula pasta or Israeli couscous. You can buy fregula online, or you can find it at many good Italian specialty shops nationwide. Or sub in orzo.
Sardinian Mussel Soup with Fregula
- 2 pounds mussels in their shells
- 2 pounds small clams in their shells
- 1 quart chicken stock, or freshly made shellfish or fish stock
- 1 cups seawater or salty tap water
- 1/4 cup olive oil
- 5 thinly sliced garlic cloves
- 1/2 cup coarsely chopped roasted red pepper
- 1/2 cup chopped parsley
- 1 cup sea beans (optional)
- 1/2 teaspoon cayenne
- A healthy pinch of saffron, or 1 packet of saffron powder
- 1/2 pound fregula pasta, or other small soup pasta
- Grated zest of a lemon
- 2 tablespoons chopped chives
- If you are using wild mussels, scrub their shells and pull off their beards. You should not have to do this with farmed mussels. (Here's a video on the process from my friend Becky.) Scrub the shells of the clams, too.
- Pour the seawater or salty tap water into a large, wide pot with a cover and bring it to a boil. Add the mussels and steam them open, removing each one just as it opens. This should take 3 to 5 minutes. Do the same with the clams. Pick out most of the meats from the shellfish; put them into a bowl with some olive oil. Leave a few mussels in the shell if you want — it makes the soup look more interesting.
- Strain the shellfish broth though cheesecloth or a paper towel into a bowl and set aside. Crumble the saffron into it while it is still hot.
- In a large soup pot, heat the olive oil over medium-high heat and saute the garlic for a minute or so. Add the cayenne, parsley, stock and shellfish broth and mix to combine. Bring it to a boil and add the fregula pasta. Simmer this until the pasta is nearly done, about 10 minutes.
- Add the roasted red pepper, shellfish, sea beans (if using) and cook for another 3 minutes. Right before you serve, add the lemon zest and chives. Serve with crusty bread and a crisp white wine.