What “dry soup” means
A sopa seca is a “dry soup”, which sounds like a contradiction. The name makes sense once the dish is understood as a course. In a traditional Mexican midday meal, the first course is a brothy soup, or sopa aguada. The next is the sopa seca: a dish of pasta or rice cooked in a seasoned liquid until that liquid is almost completely absorbed. It is still called a soup because it is made by the same methods, simmered in broth, and because it occupies the soup part of the meal. It is eaten with a fork or spoon, and it does not have the broth of the earlier course.
The main dish then follows, usually with tortillas, beans and salsa. The idea of a full comida with several courses is not followed in every household, and plenty of families treat the sopa seca as a side dish or even a light meal on its own.
Pasta as a dry soup
Pasta is common in Mexican home cooking, and the best-known dry soup of this kind is made with fideo, thin vermicelli-style noodles. The method is related to that of red rice:
- Break the noodles into short pieces, if they are not already in nests or coils.
- Fry them in a little oil, stirring, until they turn deep golden brown.
- Add a blended puree of tomato, onion and garlic and let it sizzle and reduce.
- Pour in stock and a little salt, and stir once.
- Cover and simmer over low heat until the noodles have absorbed the liquid and are tender.
The frying step is the key. It gives the noodles a nutty flavor and helps them keep their shape. Watch closely, because thin noodles can go from golden to burnt quickly, and the pan will spit if liquid hits hot oil. Cooks differ on how much liquid to add: too much produces a mushy dish and too little leaves the pasta firm, so adjusting by feel is normal.
Other pastas follow the same logic. Elbow macaroni, shells and spaghetti all appear. A well-known variation uses spaghetti in a creamy sauce of roasted poblano chiles, a dish sometimes called espagueti verde. Others are baked with cheese or cream. Many of these sit somewhere between a side dish and a casserole.
Rice as a dry soup
Rice fills the same role. Red rice, white rice and green rice are all served as a sopa seca, and Mexican red rice is the most familiar of them. White rice, often called arroz blanco, is cooked with garlic and onion but without tomato. Green rice, arroz verde, gets its color from a blend of poblano chile, herbs and sometimes spinach. Others add peas, carrots or corn kernels. In all cases the rice is typically toasted in oil first and then steamed with a tight lid.
Why the course exists
There are a few plausible reasons that this separate course became part of the meal, though historians do not point to one settled explanation. Dried pasta and rice are inexpensive, filling and easy to store. The dish adds substance before the main dish, and it can be made with the same stock used for the first course, so little goes to waste. It also offers a quieter, starchy pause between two more strongly flavored courses.
Both rice and wheat pasta arrived in Mexico through European contact, and their absorption into daily meals shows how readily the cuisine adapts new ingredients to existing habits. Describing exactly when the sopa seca became a convention is difficult, so it is better left unspecified.
Serving
A sopa seca is usually served hot in a modest portion, perhaps garnished with crema, crumbled cheese, a bit of cilantro or avocado. Some diners add a squeeze of lime. Because it is meant to precede a main dish, the portion is smaller than a full meal. The shared habit of lingering over a long meal is related to the idea of table sobremesa, and a course structure like this encourages that slower pace.
Planning around it
If you are building a full meal with a sopa seca, the other dishes should contrast with it: a brothy first course, a main dish with sauce or grilled meat, and tortillas on the side. A creamy sopa seca goes well with a plain main, while a tomato-based one pairs with richer or spicier plates. The role the dish plays also connects to the wider mealtime rhythm of the Mexican day.
Cooked pasta and rice should be refrigerated promptly after the meal and reheated until steaming hot. A splash of water or stock helps loosen leftovers when they are warmed in a pan.