Build a medium fire with hardwood coals — oak or fruitwood work beautifully here. You want gentle, even heat for this dish.
Quickly char the asparagus spears over direct heat for 2-3 minutes, just to kiss them with smoke. They should still be crisp. (The fire adds a subtle smokiness that transforms this humble casserole)
Arrange the fire-kissed asparagus in a cast-iron Dutch oven or heavy baking dish. Layer the water chestnuts over top, then pour the mushroom soup evenly across.
Toss breadcrumbs with melted butter and scatter over the surface. Place the dish at the edge of your coals where the heat is gentle and indirect.
Cook for 25-30 minutes until the top is golden and the asparagus is tender. Rotate the dish occasionally for even browning.
If you must cook indoors, a 350°F oven works, though you'll miss the subtle smoke that makes this special. Char the asparagus in a cast-iron pan first to mimic some of that fire flavor.
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