In a large deep pot over medium-low heat, melt the butter. Add the potatoes and sprinkle with pepper, 2 Tbs Old Bay and a dash of salt. Cook, stirring occasionally for 2-3 minutes.
Add the stock and bring to a boil. Reduce to a simmer and add 2 Tbs lemon juice, wine and tomatoes. Cover and cook until the potatoes are tender; 20 minutes to 1 hour.
Just before serving, add the crab and simmer just until heated through.
Serve hot with Saltine crackers.
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