In a med mixing bowl. Mix cream cheese and mustard till smoth. Now add onions,peanuts,and celery. Mix. now add tuna.Mix again.
Take 2 slices of bread. spread butter on one side of each slice. Put buttered side down in pie iron. Spread a little mix on bread. Top with another slice of bread,buttered side up. Close pie iron. cook for 10-15 min. Open pie iron and let cool. Let's eat.