Step 1

Preheat oven to 220°C/200°C fan-forced. Line 2 baking trays with baking paper. Place chips on a prepared tray. Bake chips for 35 minutes or until cooked through and golden-brown.

Step 2

Coarsely tear 1 roll, then process in a food processor until fine crumbs form. Transfer to a bowl. Process beetroot until very finely chopped. Add beetroot to breadcrumbs. Add lentils, egg and garlic to beetroot mixture. Mix well to combine.

Step 3

Shape mixture into 4 equal patties. Dust in flour and place on remaining prepared tray. Chill for 15 minutes. Spray patties with oil. Heat oil in a large frying pan over medium-high heat. Add patties, cooking for 2 minutes each side or until browned. Return to tray, then bake.

Step 4

Slice avocado. Split and toast remaining rolls. Place roll bases on plates. Top each base with 1 tbs hummus, some rocket, a patty and some avocado. Season with freshly ground black pepper. Top with roll lids. Serve with fries and remaining hummus.