I believe I found this in a Sherlock Holmes cookbook.
Cooking twenty-five asparagus spears alongside a half pound of spinach in a limited volume of liquid demands strict temperature control to prevent chlorophyll degradation. Boiling green vegetables causes plant cell walls to soften while releasing organic acids that turn vibrant pigments olive-brown. Retaining brightness requires plunging the stalks into actively boiling stock and removing them the moment fork-tender resistance vanishes at roughly 212 degrees Fahrenheit.
Modifying this formulation for alternative dietary needs alters how the emulsion behaves in the bowl. Traditional roux relies on 0.5 ounces of wheat flour cooked in 1.5 teaspoons of butter to gelatinize starches before liquid enters the pan. Replacing dairy cream with plant-based milks requires careful consideration of fat content. Higher fat content prevents curdling when introduced to simmering chicken or vegetable stock.