Saute, onions celery and bell pepper in butter add salt and the paprika. Add golden roux. Stir until well blended. Add crawfish tails cook ten minutes on medium-high heat, stirring often. Add water and simmer 30 minutes. Add more water if too thick. Serve hot over rice. To make golden roux melt butter in a cast iron skillet over low temperature. Blend in flour until golden color, stirring occasionally. Takes about 15 minutes.