A few concerns come up repeatedly, and most have straightforward answers.
The Other Common Questions
- Does it take longer: yes, and it needs no attention
- Is it worth it for steak: it is the clearest demonstration
- Can I open the bag to check: better not, but it is not ruined
- Does it need a vacuum sealer: no, water displacement works
- Can I cook two things at once: if they need the same temperature
- Is the meat safe if pink: colour is not the indicator, time and temperature are
Equipment sized for household use, of the kind catalogued at https://everie.us.com/, makes several of these questions practical rather than theoretical.
Is Cooking in Plastic Safe
Bags intended for cooking, used within the manufacturer’s stated temperature range, are made for this.
Sous vide temperatures are moderate compared with boiling or frying, which is part of why the method is considered acceptable.
Use bags sold for cooking or vacuum sealing rather than general-purpose plastic, and follow the maker’s guidance.
Why Is It Not Browned
Browning needs temperatures far above anything a water bath reaches.
The sear afterwards is a separate step rather than optional, and it takes a minute.
Can I Leave It Running
Yes, with a lid, a check before bed and normal appliance precautions.
If it fails for an unknown period, the food should be discarded rather than judged.
Why Does the Bag Float
Air left in it, or gases released by the food. A rack or a weight fixes it, and floating is a safety issue rather than cosmetic.
Do I Need to Rest the Meat
Very briefly or not at all, since the interior is already even.
Read the Tables
Which answers most of the rest.
Use Bags Made for Cooking
Rather than general-purpose plastic.
Colour Is Not Doneness
Time and temperature are.
Displacement Works Fine
A vacuum sealer is convenient rather than necessary.
Sear Every Time
Which is what the bag cannot do.
Floating Is a Safety Issue
Not a cosmetic one, since part of the food is not being cooked.
Read the Tables Once
Which answers most of the rest.
Ask Before Improvising
Particularly on anything involving time and temperature.