- ½ ounce dried porcini mushrooms
- 1 cup chicken stock
- 1 thick Parmesan rind
- 3 tablespoons butter
- 1 small shallot, minced (about ¼ cup)
- 1½ pounds mixed mushrooms, sliced
- 1 tablespoon sherry vinegar
- 2 tablespoons chopped tarragon
- Salt and freshly ground pepper
- 6 thick slices crusty bread, toasted
- ¼ cup extra-virgin olive oil
- 6 poached eggs
- In a small, heatproof mixing bowl, pour 1 cup of boiling water over the dried porcinis and let soak until softened, about 15 minutes. Meanwhile, in a medium saucepan, bring the chicken stock to a simmer over medium heat and add the Parmesan rind. Reduce the heat to low, cover and simmer gently.
- Drain the porcinis, straining and reserving the soaking liquid. Coarsely chop the porcinis and set aside. Add the soaking liquid to the simmering chicken stock and simmer gently.
- Meanwhile, in a large, deep skillet, melt the butter over medium-high heat. Add the shallot and cook until softened, about 3 minutes. Add the mushrooms and reserved porcinis and cook, stirring occasionally, until the mushrooms have begun to brown, about 15 minutes.
- Remove and discard the Parmesan rind from the saucepan and add the chicken-mushroom stock to the skillet. Bring the mixture to a boil over medium-high heat simmer, stirring frequently, until the liquid has reduced by one-third, about 10 minutes longer. Remove the skillet from the heat, stir in the sherry vinegar and tarragon and season to taste with salt and pepper.
- Arrange the toasted bread on a platter and drizzle with the olive oil. Spoon the mushrooms over the bread and top each portion with a poached egg. Season with salt and pepper and serve immediately.