Vegetarian recipe ideas
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Put the mayonnaise, celery, lemon juice and tarragon in a bowl, season and stir well. Fold in the crab and avocado.
Split the rolls vertically down the middle (but not completely), and spread with the butter. Fry butter-side down in a frying pan over a medium heat until golden. Cool a little.
Fill with the crab mix and some cress then finish with a pinch of cayenne pepper.