Combine the beans, onion, olives and tomatoes in a medium mixing bowl. Set aside.
Put the olive oil, rosemary, garlic clove, salt and lemon juice in a blender.
Drain the oil from the tinned mackerel and add also. Process until smooth.
Break the mackerel fillets into medium chunks and gently stir them into the beans. Stir in the chopped parsley.
Refrigerate for about an hour. When ready to serve, season with salt and pepper.
Top each serving with the crumbled feta.
Combine the beans, onion, olives and tomatoes in a medium mixing bowl. Set aside.
Put the olive oil, rosemary, garlic clove, salt and lemon juice in a blender.
Drain the oil from the tinned mackerel and add also. Process until smooth.
Break the mackerel fillets into medium chunks and gently stir them into the beans. Stir in the chopped parsley.
Refrigerate for about an hour. When ready to serve, season with salt and pepper.
Top each serving with the crumbled feta.