In a large bowl combine the flour, salt, canola oil and activated yeast. Note that if you are using instant yeast then combine the flour, salt, canola oil, instant yeast and 150ml lukewarm water.
Begin mixing, and continue to add the rest of the water gradually until the dough pulls away from the sides of the bowl. (Don't add all of the remaining water at once). Now the fun starts. Knead the dough for approximately 5 minutes in a stand mixer (+/- 9 minutes by hand).
The dough should be soft and smooth but still a little sticky to the touch. Don't add too much flour! After a few minutes of kneading, stop, grab a small piece of dough and roll it into a ball. If you can do that without it sticking all over your hands it is ready to go. You might find you added too much water, if that is the case add a little more flour until you reach this desired consistency.
Add the dough to a large bowl with nonstick cooking spray. Cover the bowl with plastic wrap and let it rise until double in size. This can take anything from 60 to 90 minutes. (Depends on the warmth of the kitchen).
Lightly punch down the dough and turn it out onto a lightly greased countertop. Divide it into equal sizes. My personality won't allow me to guess "equal sizes" and I, therefore, rely on a kitchen scale to make equal sizes. I have found that 60g is a great size for a dinner roll or lunchbox roll. Put the rolls onto a prepared baking tray (ensure enough spacing between them) and let rise a second time until the rolls are double in size. (About 40 minutes)
Finally, bake the rolls at 200 degrees Celsius (400 degrees F). Brush with melted butter if you wish.