The food at Red Rock Bistro & Bar is a bonus. The beautiful view of the pounding Atlantic surf and Boston skyline is filling enough. On the other hand, we would never give up chef Allen Bohnert's brunch menu of fluffy mushroom-, cheese-, and spinach-stuffed omelets; challah French toast with ruby-red strawberries; or blueberry flapjacks with cassis butter. It's worth setting the alarm clock on a Sunday. Ease out of your postbrunch food coma with a long walk along the soft sand beach below the restaurant.