Possible Clues:

• "5, Rue __": French kids' TV show
• With 1-Across, bun topper
• Seed used to make tahini
• Kind of seeds used in tahini
• Sam has to look out for Ali Baba's opening word in panto
• Bagel sprinkle
• Seed houses a meaty bit
• Tahini seems a paste
• see 27 down
• Look round US uncle's plant