Step 1 Place the diced zucchini in a colander and sprinkle liberally with 1 teaspoon salt. Toss to coat evenly and set aside to drain until the zucchini has begun to soften (the cut edges will appear slightly rounded), about 30 minutes. Rinse well under running water and pat dry with a tea towel.
Step 2 Meanwhile, rinse the lentils under running water and add them to a large pot of rapidly boiling, liberally salted water. Return to a simmer and cook until they are tender, 20 to 30 minutes. Drain the lentils, rinse under running water to stop the cooking, and turn them out into a tea towel to dry and finish cooling.
Step 3Stir the lentils, chives and garlic together in a large bowl with 2 tablespoons olive oil. Season with with one-half teaspoon salt and one-eighth teaspoon pepper, or to taste. The mixture should be highly seasoned.
Step 4Stir in the zucchini, cherry tomatoes and lemon juice. Gently fold in arugula leaves. Add just enough olive oil to barely moisten the arugula (you may not need to add any). Stir in the pine nuts and serve at room temperature.