Exclusion criteria
  1. Any history of severe food induced anaphylaxis (defined as a reaction requiring two or more doses of intramuscular adrenaline)
  2. Pre-existing tree nut allergy (parent-reported)
  3. Tolerance of any tree nut (ingestion of 1 teaspoon on >3 occasions without reaction)
  4. Not commenced or unable to eat solid food
  5. Taking beta-blocker medication.