In a large mixing bowl, combine the flour, baking powder, sugar, and salt. In a separate bowl, combine the eggs, milk, vinegar, beer, and sour cream. Using a rubber spatula, fold the wet ingredients into the dry ingredients until they are well blended.
Heat a greased griddle or large saute pan. Place a desired amount of the batter on the griddle. After the batter has been placed, put the desired amount of mango and blueberries into the pancake batter. When bubbles begin to appear on the surface, flip the pancake over and finish cooking until lightly golden in color. Repeat with each pancake.
Serve a stack of pancakes with butter and maple syrup.
Recipe courtesy of Richard Hatch, Blue Heaven, Key West, FL