Mushroom Toast

Name: Mushroom Toast
Ingredients: 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