A savory side with room for citrus
Mushrooms with epazote and onion bring an earthy, savory note to a table full of bright coastal flavors. The mushrooms give the dish substance, the onion turns sweet in the skillet, and a small amount of epazote adds an herbal aroma. A squeeze of lime at the end keeps the side lively without covering up those flavors.
This is a flexible vegetable dish rather than a sauce-heavy preparation. Serve it beside cooked fish or shrimp, add it to a plate of beans and rice, or set it out with warm tortillas for guests to assemble their own bites. It is best made shortly before eating, while the mushrooms still have browned edges.
Choose the mushrooms and epazote
For about four side servings, use 1 pound of cultivated mushrooms, 1 medium onion, 2 tablespoons of neutral oil, 1 small garlic clove, 1 to 2 tablespoons of chopped fresh epazote leaves, salt, and a lime wedge or two. Cremini or white button mushrooms work well; a mix of cultivated varieties is also fine. Choose firm mushrooms, trim any dry stem ends, and wipe away visible grit or rinse them briefly and dry them well before slicing.
Epazote has a distinctive, assertive flavor, so start with the smaller amount if it is new to you. If you have dried culinary epazote instead of fresh, begin with a small pinch and adjust after tasting. If you cannot find it, cilantro added off the heat offers a fresh finish, though it will make a different-tasting dish. Use mushrooms sold for eating rather than foraged mushrooms unless their identification is certain.
Brown first, then season
Slice the mushrooms about 1/4 inch thick and thinly slice the onion. Heat a wide skillet over medium-high heat, add 1 tablespoon of oil, then spread in half the mushrooms. Let them sit for a minute or two before stirring. Cook until their released moisture has mostly evaporated and browned spots appear, then transfer them to a plate. Repeat with the remaining oil and mushrooms. Working in batches helps the mushrooms brown instead of steam.
Lower the heat to medium. Add the onion to the skillet with a pinch of salt and cook, stirring occasionally, until softened and lightly golden, about 6 to 8 minutes. Add the minced garlic and stir briefly, just until fragrant. Return the mushrooms to the pan and cook for another minute or two, until heated through. Stir in the epazote near the end so its aroma remains noticeable, then taste and add salt as needed.
Finish with a modest squeeze of lime immediately before serving. If the skillet looks dry while the onion cooks, add a splash of water and scrape up the browned bits; there is no need for a heavy dressing. Cooking time will vary with the pan and the moisture in the mushrooms, so use their color and texture as your guide.
Make it fit the rest of the plate
Keep the seasoning simple when the main dish already has a punchy salsa or marinade. For a little heat, cook a finely chopped chile with the onion, adjusting the amount to your preference. For a more substantial side, fold in cooked beans just long enough to warm them. Either addition should leave the mushrooms and epazote at the center of the dish.
These mushrooms are particularly useful alongside plainly seasoned, fully cooked seafood, where their savory flavor contrasts with lime and fresh herbs. If you are serving a raw or citrus-marinated seafood dish as well, follow appropriate seafood-handling guidance: citrus curing changes texture and flavor but does not make raw seafood equivalent to cooked seafood. Keep seafood properly chilled and use separate utensils and surfaces to avoid cross-contact.
Serve warm and save leftovers promptly
Spoon the mushrooms into a shallow serving bowl so they do not sit in a deep pile and soften from their own steam. Offer lime wedges at the table and, if you like, tortillas or rice to catch the juices. A crisp cabbage salad or sliced cucumber makes a refreshing partner without competing with the epazote.
Refrigerate leftovers promptly in a covered container. Reheat them in a skillet until hot, letting excess moisture cook away before serving. The mushrooms will be softer the next day, but their flavor makes them a useful addition to a cooked-vegetable taco or a simple grain bowl.
