Place red onion slices into a bowl and cover with ice water; stir in vinegar.
Place lentils into a saucepan with water and bring to a boil; reduce temperature to low and simmer until lentils are tender and still keep their shape, 5 to 10 minutes. Stir 1 teaspoon salt into lentils and let sit off the heat for 1 minute; drain and transfer lentils into a salad bowl.
Drain onion slices; gently fold onion, cherry tomatoes, parsley, cilantro, lemon juice, and olive oil into lentils. Season with salt and black pepper.
Heat a heavy skillet over high heat and pour in vegetable oil; remove skillet from heat and stir in cumin seeds, garlic, and chile pepper. Cook and stir until fragrant, about 30 seconds; stir in tamarind paste and turmeric. Mix well for 30 seconds. Pour tamarind mixture over lentils, toss to coat, and serve.
Tips & Tricks
Strawberry Spinach Salad I
This bright and tangy salad is sweet and savory, and just delicious.
Healthy Garden Salad
This colorful, healthy salad stars black beans, corn, tomatoes, and edamame.
Be sure not to overcook the lentils; they should be just tender and not broken apart.