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This soup derives its body and rich flavor from pureed broccoli stems and florets.

Buying beets with the greens attached—as required for this recipe—is a sure way to know they’re fresh. Beets are often cooked before they’re peeled or cut to keep nutrients intact. Here, the prep work is done first without sacrifice: The juices that result make up the nutritious broth and give the soup its deep flavor and color.

The stock must be refrigerated at least 6 hours; make it 1 day ahead.

You can also serve this soup cold or at room temperature. Puree it in batches to prevent overflow (particularly because you do so while it’s hot), if needed. You can stir in a small amount of water to thin the soup after pureeing it, if you like.

This soup can be made up to 1 day ahead and stored, covered, in the refrigerator; stir it again before serving, as it may separate while it sits. Poblano chiles vary in heat from mild to hot; you may need more or less to taste. If you like, garnish each serving with more cooked corn.

You can use the mushroom broth from this recipe in other soups and dishes as well; it is particularly good in risottos. For a heartier version, add cooked and drained soba or udon noodles, or serve brown rice on the side. This soup can be prepared through step 2 up to 3 days in advance; for best results, store the broth separately from all other items. Proceed with step 3 the day the soup will be served.

The stew can be made without dried limes or lime powder; just use the 1/2 cup lime juice called for as a substitute for the powder.

Steps 1 and 2 can be done up to 1 day ahead; refrigerate until ready to serve.