Possible Clues:

• Popper center
• Hot type of pepper
• Chipotle, e.g.
• Very hot Mexican pepper
• Heat source?
• A particular friend, a judge, sent back hot pepper
• Berliner's agreed return of single friend is means to spice things up?
• Jack has a drink, one knocked back with pepper
• Dutchman's definitely going to old country, up for something hot
• Pepper with a punch