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Put the tuna in a shallow dish, drizzle over the oil and lemon juice, scatter over the garlic and rosemary. Turn the tuna so it’s well coated. Cover and put in the fridge for 30 minutes (you can leave it for longer if convenient).
Tip the beans into a large bowl. Toss in the tomatoes, onion and rocket. Put the oil, lemon juice, mustard, honey and salt and pepper in a screw top jar. Seal and put aside.
Heat a cast iron ridged grill pan or frying pan until very hot. Cook the tuna on a moderately high heat for 2 minutes each side – don’t overcook or it will be dry.
Shake the dressing. Pour over the salad. Mix. Serve the salad with the tuna on top.