Broil 2 halved plum tomatoes, 2 seeded jalapenos (both skin-side up) and 4 unpeeled garlic cloves until charred, 6 minutes. Peel the garlic and chop with the vegetables. Saute 1/2 cup minced onion and 1/2 pound sliced mushrooms in olive oil with salt to taste, 8 minutes. Add the tomato mixture, 1/2 cup chicken broth and some chopped parsley; cook 5 minutes. Stir in the juice of 1 lime.