What process does the liver use that does not require an external ingredient for "detox"?

Built-in enzymatic pathways (Phase I and Phase II detoxification)

The liver is inherently equipped with complex, sophisticated internal systems designed to neutralize and eliminate harmful substances from the body without the need for external ingredients to initiate this process. These sophisticated internal mechanisms are collectively known as Phase I and Phase II detoxification pathways. These pathways are perpetually active, diligently working to process toxins generated during normal metabolic functions. The function of nutrient-dense foods like onions is not to execute this core detoxification but rather to supply the necessary protective agents or building blocks, ensuring these existing, complex enzymatic pathways can operate optimally and remain shielded from excessive oxidative damage that can impair their efficiency.