1. Cook the quinoa: In a pot, bring 2 cups of water to a boil. Add the rinsed quinoa, reduce heat to low, cover, and simmer for 15 minutes. Remove from heat and let it sit for 5 minutes, then fluff with a fork.
2. Prepare the kale: While the quinoa is cooking, chop the kale and place it in a large mixing bowl.
3. Add the remaining ingredients: Add the cherry tomatoes, cucumber, red onion, olive oil, lemon juice, salt, and black pepper to the bowl with the kale.
4. Combine: Add the cooked quinoa to the bowl and toss everything together until well combined.
5. Serve: Serve immediately or refrigerate for later. Enjoy!