>> source: https://www.pbs.org/newshour/arts/watch-one-recipe-ina-garten-says-everyone-know-make

In a #small bowl{} (or large measuring cup), whisk together the @Champagne vinegar{3%Tbsp}, @Dijon mustard{1/2%tsp}, @garlic{1/2%tsp}, @egg yolk{1}, @salt{3/4%tsp}, @pepper{1/4%tsp}.

While whisking, slowly add the @olive oil{1/2%cup} until the vinaigrette is emulsified. Toss the greens with enough dressing to moisten and serve immediately.