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For the grilled fish: Heat a grill or heavy grill pan over medium-high heat. If using a grill, coat the fish with the oil, season with salt and pepper and add to the grill using tongs to adjust the fish and prevent sticking. If using a grill pan, season the fish with salt and pepper and add the oil to the grill pan (if the oil begins to smoke, reduce the heat slightly). Cook the fish until white on all sides and edges and firm to the touch, 3 to 4 minutes per side.
Just before serving, add the tomatoes and arugula to the beans and stir in to heat the tomatoes and wilt the arugula, just a few minutes. Serve with the fish.