Steak, shallot & black bean tostadas Serves: 4 Ingredients 400g skirt steak 1 pack Bart chipotle spice mix 3tsp oil ½ lime 8 shallots 6 cloves ¼tsp chilli flakes 2 x 390g tinned black beans, drained 8 corn tacos sour cream and coriander to serve Instructions Reserve 1tsp of the Bart chipotle rub and put