Preparation Melt butter in heavy large skillet (preferably cast iron) over medium-high heat. Add onion; cook until golden, about 5 minutes. Add zucchini and peppers; cook until beginning to soften, stirring often, about 5 minutes. Add lima beans and corn; cook until heated through, stirring constantly, about 5 minutes. Mix in marjoram. Season with coarse salt and black pepper. Transfer succotash to large bowl and serve.
Preparation Melt butter in heavy large skillet (preferably cast iron) over medium-high heat. Add onion; cook until golden, about 5 minutes. Add zucchini and peppers; cook until beginning to soften, stirring often, about 5 minutes. Add lima beans and corn; cook until heated through, stirring constantly, about 5 minutes. Mix in marjoram. Season with coarse salt and black pepper. Transfer succotash to large bowl and serve.