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Heat grill to high. Stir the first six ingredients together in a medium pan. Bring to the boil, then turn down the heat and simmer for 4-5 mins.
Meanwhile, spread the baguette slices over a baking sheet and slide under the grill. Toast on one side, turn over and sprinkle the second side with the cheese. Grill for another 1-2 mins until melted and golden brown. Season the beans to taste and serve over the cheesy toasts.