Preparation Heat oil in heavy large skillet over medium heat. Add onion and sprinkle with coarse salt. Sauté until soft and translucent, about 5 minutes. Add garlic; stir until fragrant, about 1 minute. Add tomatoes, corn, and lima beans. Reduce heat to medium-low, cover, and simmer until corn and lima beans are tender and tomatoes are soft, about 20 minutes, stirring occasionally. Season to taste with salt and pepper. DO AHEAD: Can be made 1 day ahead. Cover and chill. Rewarm before continuing. Stir in basil and serve.
Preparation Heat oil in heavy large skillet over medium heat. Add onion and sprinkle with coarse salt. Sauté until soft and translucent, about 5 minutes. Add garlic; stir until fragrant, about 1 minute. Add tomatoes, corn, and lima beans. Reduce heat to medium-low, cover, and simmer until corn and lima beans are tender and tomatoes are soft, about 20 minutes, stirring occasionally. Season to taste with salt and pepper. DO AHEAD: Can be made 1 day ahead. Cover and chill. Rewarm before continuing. Stir in basil and serve.