1Preheat oven 200°C fan forced. Slice sweet potato into 1cm-thick rounds. Place into a roasting pan. Drizzle with olive oil, season, turn to coat. Roast 30 minutes, turning once until golden and tender.
2Combine butter and mustard, spread over one side of each piece of toast. Top with ham, roasted sweet potato and cheese. Place under hot grill until light golden. Serve with tomato chutney and rocket leaves.