Begin by washing all the veggies for the peri-peri marinade. Then chop the peppers in half, quarter and peel the red onions and finally peel the garlic cloves. Place the peppers, red onions, garlic cloves and red chillis onto a baking tray and grill at 300 degrees for 10 minutes.
Allow the veg to cool for 10 minutes before adding to a food processor along with olive oil, apple cider vinegar, lemon juice, lemon zest, coriander, smoked paprika, oregano, salt, black pepper, and brown sugar.
Blend until smooth. Taste and adjust seasoning if necessary, adding more salt, sugar, or lemon juice as needed.