How to Make It
Put the pecans in a bowl and cover with cold water. Let stand for 1 hour.
Meanwhile, in a small heatproof bowl, cover the porcini with the boiling water and let stand until softened, about 15 minutes. Rub the porcini to remove grit; transfer them to a small bowl. Reserve the soaking liquid.
Cut the portobello caps in half and, with a sharp paring knife, trim off the dark gills on the underside of each one. Slice the caps into 1/4-inch-thick pieces.
In a bowl, whisk together the tamari, olive oil, nutritional yeast, lemon juice, rosemary and miso. Add the sliced portobellos and toss to coat thoroughly. Let stand for 15 minutes, tossing occasionally.
In a small saucepan, combine the soaked porcini and sun-dried tomatoes. Slowly pour in the porcini soaking liquid, stopping before you reach the grit at the bottom. Bring the liquid to a boil, cover and simmer over low heat until the tomatoes are tender, about 4 minutes.
Drain the pecans and transfer them to a food processor. With a slotted spoon, transfer the marinated portobellos, porcini and tomatoes to the processor; puree to a coarse paste, adding about 1/4 cup of the porcini cooking liquid. Add a little more of the porcini liquid if the mixture is too thick. Season lightly with salt.
Transfer the pâté to a crock and serve with toasted baguette rounds.
Nutritional yeast is available at health-food stores and at vitaminshoppe.com.