2 tablespoons unsalted butter
1 sweet onion, finely chopped
2 tablespoons minced fresh ginger
2 teaspoons Madras curry powder
3 tablespoons mango chutney (preferably Major Gray), chopped
8 ounces cream cheese, softened
1 cup mayonnaise
2 tablespoons fresh lime juice
2 scallions, thinly sliced
1/4 cup finely chopped cilantro
1 pound lump crabmeat, picked over
Salt and freshly ground pepper
Mixed sweet potato, vegetable and pita chips, for serving