Pick over lentils, removing pebbles or debris, and rinse. Bring a large pot of water to boil and add lentils and bay leaf. Reduce to medium-low and cook lentils at a slow simmer for 20 minutes, or until tender but not mushy. Drain and rinse with cool water to stop the cooking process.
In separate pot, blanch green peas for 2 to 3 minutes; drain and rinse with cool water.
In small bowl, combine herbs, vinegar, olive oil, and salt.
In large bowl, place cooked and cooled lentils. Pour dressing overtop lentils; add green onions, peas, and baby spinach; and toss together. Tip out onto large shallow platter to serve.
Enjoy!