2 pounds ripe tomatoes (5-6 medium), cored, seeded and chopped
Salt
3 T chopped cilantro
6 scallions, 2 minced and 4 with green parts sliced thin (white parts discarded)
5 tablespoons plus 2 teaspoons fresh lime juice (about 3 limes)
2 jalapeno chiles, stemmed, seeded and minced
1 15-ounce can black beans, drained but not rinsed
2 garlic cloves, minced
¾ teaspoon chili powder
1½ cups low-fat sour cream
1 tablespoon minced canned chipotle chiles in adobo saurce
2 ripe avocados, halved, pitted and cubed