Heat a large nonstick skillet with a lid over medium-high heat and add the canola oil.
Arrange dumplings in a single layer, flat side down, leaving a little space between each one.
Cook uncovered for 2 to 3 minutes, until the bottoms are nicely golden and crisp.
Carefully pour in the 1/4 cup water, then immediately cover the pan to trap the steam.
Reduce the heat to medium and steam for 5 to 6 minutes, until the water has mostly evaporated.
Remove the lid and cook 1 more minute to re-crisp the bottoms, checking that the pork is cooked through.
The filling should reach 165°F or show no pink when you cut into one dumpling.
Transfer cooked dumplings to a plate and repeat with the remaining batch if needed, adding a splash more oil as required.