Manage thickness after pressure
Lentils expand and thicken as they stand. Keep the pressure phase adequately liquid and add rich coconut milk after release.
Thin with hot broth before serving if needed.
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Pressure cook
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Pressure cook red lentils, tomatoes, aromatics, and spices, then add coconut milk after release.

Lentils expand and thicken as they stand. Keep the pressure phase adequately liquid and add rich coconut milk after release.
Thin with hot broth before serving if needed.
Beans and lentils can foam. Use the natural release and never cover the valve with a towel.
If the cooker spits liquid, stop venting and wait longer.
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Instant Pot Duo 7-in-1 makes the most sense for first-time electric pressure cooker buyers who want the classic Instant Pot experience without paying extra for upgrades they may not use.

Instant Pot Duo Plus V4 fits home cooks who like the Instant Pot style but want a more capable all-purpose model than the entry-level Duo.
Safety note: Stay below the model's lower fill limit for expanding foods and confirm the steam path is clean before cooking.