Why this works
Eggs are multifunctional - emulsify (yolk lecithin), bind (whole-egg coagulation), aerate (whipped white foam), enrich (yolk fat), color (yolk carotenoids), and brown (Maillard). The egg-products rule covers swaps WITHIN the egg-product family (chicken, duck, quail, liquid, pasteurized, white alone, yolk alone) by weight: (1) master ratio is 1 large egg = 50 g out of shell across the whole-egg tier; (2) liquid egg cartons are not interchangeable - some are whole-egg (1:1 by weight), others are egg-white-only (Egg Beaters Original is 99% whites) and live in the white tier; (3) duck and quail scale by weight - 1 duck = 1.5 chicken, 5 quail = 1 chicken; (4) yolk-vs-white is asymmetric and recipe-role dependent. White (30 g, ~10% protein, ~88% water) is foam-and-structure; yolk (20 g, ~33% fat, ~16% protein, ~50% water + lecithin) is fat-and-emulsifier-and-color. 2 whites do NOT replace 1 whole egg in custard, lemon curd, hollandaise, mayo, pound cake, or brioche; 2.5 yolks do NOT replace 1 whole egg in angel food, meringue, sponge, chiffon, soufflé, or pavlova. Pasteurized eggs (shell or carton liquid) are the safety standard for raw/barely-cooked recipes - pasteurized in-shell whips to ~80-85% volume of raw; pasteurized liquid whites barely whip. Chicken-egg cross-reactivity means duck and quail are NOT safe for the egg-allergic - use the egg-replacers group (flax, chia, aquafaba, silken tofu, commercial replacer).
- Flavor
- Chicken eggs are the flavor reference - mild, sulfurous, yolk-rich. Duck eggs read richer, gamy, more yolk-forward. Quail read mild. Liquid egg cartons read slightly off versus fresh - fine in scrambled but noticeable in custard. Yolks read rich, fatty, slightly sweet. Whites are nearly neutral raw, slightly sulfurous cooked. Pasture-raised eggs carry richer yolk and stronger flavor.
- Texture
- Whole eggs balance fat and structure. Liquid cartons bind/scramble like fresh but foam less. Duck eggs make taller cakes and richer custards. Whites whip to ~6-8x volume fresh, room temp, yolk-free - basis of meringue, soufflé, angel food, macaron. Yolks emulsify oil into mayo (~1/cup) and butter into hollandaise. Pasteurized in-shell whips to ~80-85% of raw; pasteurized liquid whites barely whip.
Where it fails
Very high when 2 whites replace 1 whole egg where the yolk role matters (custard, curd, hollandaise, mayo, pound cake), when 2.5 yolks replace 1 whole egg where the white role matters (angel food, meringue, sponge, chiffon, soufflé, macaron), or when any egg-products member subs for an egg-allergic person. High when raw eggs go into mayo/Caesar/eggnog/tiramisu without pasteurization, pasteurized liquid whites go into meringue (won't whip), or duck eggs replace chicken by COUNT not WEIGHT.