Drop the sliced potatoes into a pot of boiling, salted water and cook for 6 minutes. Drain, and plunge into a bowl of ice water until cool to the touch. Drain and pat dry.
Place potatoes on a baking sheet, pour on the canola oil, and toss to coat. Sprinkle with salt and pepper and place in the oven for 30 minutes, or until the potatoes begin to brown. Be sure to toss them around every 5-10 minutes to prevent them from sticking to the pan.
When the potatoes are done, place them in a bowl and pour on the oil, lemon juice, oregano and garlic. Toss well to coat and serve warm.