While tofu is marinating, Roast the pepper over an open flame or In an Oven.
Remove the pepper from the oven and let cool.
Peel the skin from the pepper. Pull out the stem and open the pepper up. Remove the seeds and dry the pepper in some paper towel or using a dish towel, to remove excess moisture.
Slice the roasted red pepper and split into 4 equal portions.
Lay each onion slice flat on a baking tray lined with parchment paper and brush with a little olive oil on both sides. Add a pinch of salt and pepper.
Roast for 25 minutes, turning halfway through.
Separate rings into 2 equal portions and set aside