Summer string beans make a quick and tasty side dish. Substitute yellow (wax) beans if you prefer, or use half green and half yellow. Tossing the warm beans with the garlic, oil, lemon, and tamari allows the flavors to infuse the beans.
Bring a large pot of water to a boil over high heat and add the beans. Cook until crisp-tender, 3 to 5 minutes, depending on the freshness and size of the beans. Drain immediately and transfer the beans to a large bowl.
Add the garlic, olive oil, lemon juice, and tamari to the beans. Toss the mixture to combine, then remove and discard the garlic. Serve at room temperature.