Ghehe, funny.
It's not known yet how garlic works, but some research showed that garlic can have beneficial effects.
Some farmers here in The Netherlands use garlic as an anti-infection agent for their cattle.
Same goes for peppers, which can act like adrenaline-like compounds and stimulate metabolism.
Metabolism and immunity are heavily related to each other (food -> fat -> inflammation -> metabolic syndrome -> diabetes)
I'm not really sure though if I would like to drink/ingest a recipe which stimulates my immune-system.
Why would I do that?
I think it's generally not desirable to unspecifically stimulate my immune system and potentially "toxicate" myself with my own pro-inflammatory cytokines which can induce all kinds of secondary inflammation-like side-effects.
Sometimes there are "tough bastards" which are really challenging for your immune system, but eventually your immune system will figure it out.
The immune system is highly adaptive, but needs time and a generally healthy host