Drain clams, and put juice on aside.
In a skillet, saute onion in 1 tbsp of butter until tender.
Stir in flour until blended.
Gradually add horseradish, garlic powder, Worcestershire sauce, salt and reserved clam juice.
Bring to a boil; cook and stir for 2 minutes or until thickened.
Remove from heat; stir in clams.
Flatten bread with a rolling pin.
Melt remaining butter; brush one side of each slice of bread.
Spread with clam mixture; roll up.
Brush with remaining butter; sprinkle with paprika.
Cut rolls into thirds; place on a greased baking sheet.
Bake at 425 degrees for 5-8 minutes or until lightly browned.
Serve warm.
PREP TIME 10 Min COOK TIME 10 Min READY IN 20 Min.