Place green beans in a microwave-safe bowl. Add just enough water to cover the bottom of the bowl, cover and microwave on high for 4 to 6 minutes until green beans are tender.
While green beans are cooking, heat 2 teaspoons of oil in a large frying pan over medium heat. Add onions and garlic and sauté until onions are translucent, about 3 minutes.
Using hot pads, remove bowl of green beans from microwave. Carefully remove cover away from face and hands to release steam, drain water, and toss green beans with salt, pepper, and remaining oil.
Add green beans and tomatoes to frying pan. Heat until tomatoes blister, shaking pan occasionally, about 2 minutes.
Transfer to serving bowl, add lemon juice, and mix gently. Serve hot or cold.
Notes
Change it Up
Add chopped herbs such as basil, thyme, or parsley.
Add ½ cup toasted sliced almonds and a little lemon zest.