Directions:
1. Remove seeds of tomatoes and dice small. 
2. Finely chop the red onion (don't be afraid to take breaks for tears...)
3. Drain can of lentils and rinse through strainer.
4. Mix together the chopped tomatoes and onion, drained lentils and drained tuna. Use a fork to break-up tuna chunks.
5. Whisk together dressing ingredients; oil, lemon juice, mustard, garlic and cumin.
6. Add the finely chopped cilantro (leaves only),
6. Pour the dressing over the salad and serve immediately. Or,  mix everything together sans dressing and keep separate until ready to serve. Add salt and pepper to taste.

*This mixtures should keep for 24 hours+ before the tomatoes begin to get mushy.