Cook the lentils: Rinse 1 cup dry green or French lentils. Simmer in salted water until just tender, about 18–22 minutes. Drain well and let cool slightly.
You’ll need about 2 cups cooked.
Prep the chicken: Use leftover roasted or rotisserie chicken, or quickly poach or grill a couple of breasts. Season simply with salt and pepper. Dice or shred into bite-size pieces.
Chop the veggies: Halve the tomatoes, dice the cucumber, and finely chop the red onion.
Roughly chop the parsley and dill or mint.
Make the dressing: In a small bowl, whisk together olive oil, lemon juice, Dijon, honey, garlic, cumin, salt, and pepper until emulsified. Taste and adjust acid/salt as needed.
Toss the lentils: While the lentils are slightly warm, toss them with half the dressing. This helps them absorb the flavor and season from within.
Combine everything: Add chicken, tomatoes, cucumber, red onion, and herbs to the lentils.
Pour over the remaining dressing and gently toss to coat.
Finish and taste: Fold in feta if using. Add more lemon, salt, or pepper as needed. If you like extra bite, sprinkle a pinch more cumin or a splash of red wine vinegar.
Serve: Enjoy right away at room temperature, or chill for 30 minutes to let the flavors mingle.
Serve over arugula or with warmed pita if you want a heartier plate.