A cook wants to prepare salmon with a silky, moist texture. Which method best achieves this, and why?
ABoil the salmon at 212°F to cook it quickly, then remove it promptly before it overcooks
BPoach the salmon at 160–180°F, where proteins denature slowly and gently without contracting and squeezing out moisture
CSteam the salmon, since cooler steam temperature prevents the proteins from tightening
DSear it in a very hot pan to quickly lock in moisture by sealing the surface
Poaching at 160–180°F gives fish proteins time to set gently without the rapid, forceful contraction that occurs at higher temperatures. At a full boil (212°F), proteins tighten aggressively, squeezing out moisture and producing a dry, rubbery result. Option C contains a common misconception: steam is actually 212°F — the same temperature as boiling water. Steaming's advantage over boiling is not lower temperature but no direct water contact. Searing creates a crust via the Maillard reaction — a different goal entirely.
Question 2 Multiple Choice
Broccoli steamed for 3 minutes stays bright green and crisp, while the same broccoli boiled for 3 minutes turns dull and soft. What is the key reason for this difference?
ASteam is cooler than boiling water, so it applies gentler heat that preserves chlorophyll
BBoiling water dissolves oxygen that oxidizes the chlorophyll, while steam is oxygen-free
CSteaming keeps the broccoli out of direct water contact, preventing water-soluble vitamins and pigments from leaching out
DTurbulent boiling water physically damages cell walls, releasing the green pigment
Steam and boiling water are both 212°F — temperature is not the difference. What changes is water contact: submerged broccoli loses water-soluble vitamins (C, B vitamins) and pigments into the cooking water, which degrades color and texture. Steamed broccoli is surrounded by vapor but never submerged, so these compounds stay inside the vegetable. Better color, texture, and nutritional value result not from lower temperature, but from no submersion.
Question 3 True / False
Steaming is a gentler cooking method than poaching because steam is cooler than poaching liquid.
TTrue
FFalse
Answer: False
Steam is 212°F — hotter than poaching liquid (160–180°F). What makes steaming 'gentle' for nutrient preservation is the absence of direct water contact, not lower temperature. What makes poaching 'gentle' for protein texture is its low temperature. The two methods are gentle in different ways and for different reasons: steaming protects water-soluble nutrients; poaching protects protein structure. Neither is universally 'gentler' than the other.
Question 4 True / False
Poaching liquid should be discarded after cooking because it has absorbed impurities and off-flavors from the food.
TTrue
FFalse
Answer: False
The poaching liquid is an opportunity, not waste. A court-bouillon or seasoned broth infuses the food with flavor during poaching, and afterward the liquid — now concentrated with the food's juices and aromatics — can be reduced into a sauce. This contrasts with boiling water, which dilutes flavors and is typically discarded. Using the poaching liquid as a sauce base is a fundamental advantage of the technique.
Question 5 Short Answer
A poached egg white tears apart in vigorously simmering water but comes out tender and intact in barely-moving water just below a simmer. Explain the protein chemistry behind this difference.
Think about your answer, then reveal below.
Model answer: Egg white proteins denature (unfold and solidify) when heated. In turbulent, vigorously simmering water, the mechanical agitation pulls at the coagulating white before it has fully set into a cohesive mass, literally tearing it apart. Even if the temperature is similar, vigorous movement disrupts the protein network as it forms. In calm, barely-simmering water, proteins denature slowly and evenly, setting into a tender, cohesive structure without being disturbed. Successful poaching depends on both gentle temperature (below boiling, to prevent rapid protein contraction) and stillness (to let the protein network set undisturbed).
This question distinguishes between temperature effect and mechanical effect on proteins. Temperature determines how fast proteins contract; turbulence determines whether the forming network is physically disrupted while setting. Both matter for the final texture. This is why poaching requires attention to maintaining a calm liquid surface — not just hitting the right temperature number.