With the food processor running, put garlic and onion through the feed tube until minced. Add cream cheese and heavy cream and process until smooth. Add in mayonnaise, sour cream, Worcestershire, and cayenne and process till smooth and equally incorporated.
Sort through crabmeat by hand to remove any shell bits. Sprinkle the crab with lemon juice, then stir it into cream cheese mixture by had. Season to taste and chill for at least 1 1/2 hours.
To serve, spoon crab mixture onto bread. Pop in the broiler for a couple of minutes until lightly browned.
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