How to Make It
Preheat oven to 375°F. Place tempeh, garlic, pepper, 1 tablespoon oil, 1 tablespoon lemon juice, and 1/2 teaspoon salt in a bowl; toss to combine. Arrange tempeh on a baking sheet. Bake at 375°F for 20 minutes, tossing once halfway through.
Meanwhile, bring a large saucepan of water to a boil over medium-high, and prepare a bowl of ice water. Add asparagus to boiling water, and cook until crisp- tender, about 3 minutes. Drain. Plunge asparagus into ice water; let stand 2 minutes. Drain. Cut asparagus diagonally into thirds. Set aside.
Combine remaining 1 tablespoon oil, remaining 2 teaspoons lemon juice, and remaining 1/4 teaspoon salt in a bowl; whisk in kvass, tahini, and sugar. Add water, 1 teaspoon at a time, until dressing reaches desired consistency.
Place arugula, kale, radishes, tomatoes, and asparagus in a large bowl or on a serving platter; gently toss to combine. Top with tempeh croutons. Drizzle evenly with kvass-tahini dressing.