This dish travels well, can be eaten cold or at room temperature, is a delicious finger food, children can even help their parents to make them the night before (perhaps by filling up the tomatoes), and they have good nutritional value, too.
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Cut the tops off each tomato with a paring knife, and reserve for later, if using. Spoon out the seeds and pulp. In a bowl, mix together the tuna, quinoa, salt, pepper, oil, and lemon juice. Fill each tomato with the quinoa mixture and press well. Cover with the tomato tops, if desired.