Frying is the best method for cooking bricks if you don’t mind the oil. It gives a better golden brown color and a crispier texture. They won’t absorb oil. That said, baking in the oven also yields great results.
Heat a frying pan with enough oil or use a deep fryer, and submerge the bricks. The oil should completely cover them.
Fry on high heat at first, and once the outer layer hardens, lower the heat to medium to achieve a nice golden brown color.
Frozen bricks are cooked the same way. Pat them dry with a paper towel if they have frost, and fry them directly without thawing.
If you prefer baking, place the spring rolls (bricks) in a preheated oven at 200°C (390°F) for 10 minutes. Then lower the temperature to 180°C (356°F) and finish baking until they turn golden brown.