1) Heat olive oil in a saucepan over medium high heat and add onion. Cook until just translucent and then add lentils.

2) Add water and cook according to package directions.

3) Drain and cool.

4) Combine lentils with tomatoes, pepper, onions, rosemary, olive oil, and vinegars. Season with salt and pepper to taste and adjust oil or vinegar as desired.

5) Serve cold or at room temperature.