Ingredient proportions alone do not reveal how this dressing achieves its emulsion when heated over high heat until the onions turn translucent. Combining fresh spinach with crisp iceberg lettuce balances sturdy greens against delicate ones, though scaling down this eight-serving yield simply requires dividing the oil and vinegar in a strict 3-to-1 ratio.
The Chemistry of Cooked Dressings
Heating the vinegar, sugar, and mustard powder dissolves the granules completely before the vegetable oil is whisked in, creating a stable suspension that clings to raw leaves without pooling at the base of the bowl. Boiling eggs for exactly 10 to 12 minutes off the heat source stops the yolks from turning chalky or developing a sulfurous gray ring.
Leaf Selection and Assembly
Fresh spinach must be thoroughly dried in a salad spinner before mixing, because residual moisture dilutes the dressing and prevents the crumbled bacon and crushed croutons from maintaining their distinct textures. Refrigerating the cooked dressing until entirely cold prevents the residual heat from wilting the delicate greens prematurely.