The word "canola" is a derivative of the phrase "Canadian oil, low acid."
Let's break that down a little further. Canola oil was first developed in Canada (in the 1970s), so that takes care of the "cano-" part of the word.
What about the "-la" or "low acid" part? Canola oil is made from varieties of rapeseed that contain very little amounts of something called erucic acid. Rapeseed naturally contains high levels of erucic acid, which has been suspected of being toxic to some animals in high levels.
People have been cooking with rapeseed oil for centuries. However, given the suspicions about its cumulative negative health effects, breeders began developing rapeseed that contained only small traces of erucic acid. And that's how "cano-" got its "-la".
To emulsify means to bind two things together that don't naturally bind, like oil and vinegar.
In order to make the combination work, you need an emulsifier, a bridge substance. Common emulsifiers include eggs (to bind oil and lemon juice for mayonnaise) and mustard (for vinaigrette).
To emulsify, you'll need a whisk, blender or food processor. When a recipe doesn't call for an emulsifier to bind, say, a vinaigrette, whisk the oil and vinegar into a temporary emulsion just before serving.
Reference: What makes a mustard "Dijon"?
Reference: Homemade mayo: worth it?
Recipe: Shallot-mustard vinaigrette
Recipe: Kalamata Olive Vinaigrette (Kalyn's Kitchen)
