Receta Tuna Chowder; blog problems

Tuna Chowder Total time: 40 minutes Ingredients: 4oz (120gr) tuna, drained weight, broken apart 1 onion, chopped 2 ribs celery, chopped 2 medium carrots, chopped 1 medium potato, chopped 2 tsp butter 3 cups  (24oz, 720ml) chicken stock 1/2 tsp tarragon 1/2 tsp dry mustard 2/3 cup (5oz, 150gr) Greek yogurt Instructions: In a large saucepan heat butter over medium heat. Add onion, celery, carrot and sauté 5 minutes. Add potato, chicken stock, tarragon, mustard and heat to boiling. Reduce heat, cover and simmer 20 minutes or until vegetables are done. Uncover, add tuna, yogurt and heat through. Serve.