Place bacon strips on a lined baking tray.

Turn the oven on and set to 200C. Do not wait for the oven to preheat.

Place tray in oven, bake for 18-20 minutes or until crisp.

Prepare all other burger toppings and set aside.

Mix all the ingredients together and divide meat mixture into 4 patties.

Shape into patties, flatten and even out the thickness.

Then using your finger or thumb, make an indentation in the middle of the patty.

The patty will puff up when cooking so this helps to offset the 'dome' and helps the burger to cook more evenly.

Cook on grill or lightly greased grill pan, at medium heat 4-6 minutes each side.

Clean mushrooms with damp kitchen towel. Do not wash!

Remove stems of mushroom if any.

Prepare portobello by using a spoon to scrape off the grills on the underside of the mushroom.

Brush on olive oil on both sides of the mushroom, and season with salt and pepper.

Grill portobello bottom side down for about 5 minutes, then turn over to grill for additional 3-5 minutes.

Build your burger!