Drain tuna. Combine tuna, hummus, spinach, carrots and cumin and mix well. Make 4 sandwiches with the tuna mixture and the bread. Beat together milk, egg, and egg whites. Heat 2 large non-stick pans over medium-low heat. Carefully dip both sides of each sandwich in the milk and egg mixture, not soaking too much but using up all the mixture. Add 1/2 tsp. oil to each pan and then fry the sandwiches, 2 per pan, about 4-5 minutes per side or until golden brown. If you prefer you can skip the milk and egg mixture and just toast the bread and add the filling.
Ready in 25 min