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About this recipe: Watercress teams well with eggs and is highly nutritious, providing iron and beta-carotene. The Gruyère cheese supplies plenty of taste without too much fat. Serve with crusty French bread for a well-balanced meal.
Plum tomatoes are a good variety to use here as they are firm-fleshed and less watery than regular tomatoes. For strict vegetarians, use the Cheddar cheese option.