Hearty Beef Noodle Casserole

1 cup noodles
1 onion
1/2 green pepper
1 stalk celery
1 tablespoon butter
250g minced steak
1 teaspoon curry powder
1 chiken stock cube
1 cup water
2 tablespoon tomato paste
salt, pepper
150g cheddar cheese

Put noodles on to cook, peel and chop onion, and gently fry vegetables until t