Mix the dough flour and salt in a bowl and stir together well. Slowly add hot water and mix with a fork until it absorbs and pieces of dough form. Then, mix in cool water and combine the dough scraps until it forms a firm dough. Adjust the consistency with more water or flour a bit at a time until it's firm and mostly dry, but not crumbly.
2 Cups Flour, ½ Tsp Salt, ½ Cup Boiling Water, ¼ Cup Cool Water
Cover the dough and let it rest for 20 minutes.
In another mixing bowl, combine the filling flour, oil, and salt, stirring it into a paste-like liquid.
⅓ Cup Flour, ¼ Cup Canola Oil, ½ Tsp Salt
After the dough has rested, knead it a bit until it's smooth. Cut the ball into six equal pieces, working with one at a time and keeping the rest covered.
Roll out the dough balls into rectangles or ovals longer than they are tall. Aim for about 6x10 inches, but precision isn't super necessary here.
Spoon or brush about a tablespoon of the liquid filling onto the dough, leaving a bit of space around the edges. Sprinkle about 2 tbsp of onion over the filling.
1 Cup Chopped Green Onions
Roll the dough into a long, thin tube, from the long end. Try to keep it tight and avoid trapping air inside. Then, roll this tube up into a spiral. Tuck one end into the middle. Repeat this with all six dough balls, leaving you with onion-filled spirals.
Carefully flatten out the spiral-balls into circles about 7-8 inches across. Don't worry if the dough tears and you lose some onions; if they stick to the surface, they caramelize nicely as you cook the pancake.
Heat up a skillet over medium-high. Add in a tablespoon of oil; once it's hot, add in a pancake, swirling it to coat it in oil. Cover the pan and reduce heat to medium, letting it cook for about a minute. Flip and cook for another minute. You're looking for a nicely golden, slightly crisp pancake here. Finally, remove the lid and cook a bit more until they're crisped up nicely.
Let cool slightly, cut into slices, and serve!