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Mash together the avocado with all of the ingredients except the tuna. Mix together well until combined and the consistency of a guacamole. Fold in the drained tuna and check for seasoning. Set aside
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Combine all of the salsa ingredients together and again check for seasoning. Set aside
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Build open face sandwiches with the tuna mixture on whatever base you like and top with the grated cheese. Broil in your oven for just 2-3 minutes until just browned. Top with the salsa and serve.