Mushroom Meatball Subs with Caramelised Onion Mayonnaise
Ingredients
Subway Rolls (see recipe here)
Mushroom Meatballs:
- 1 tbs olive oil
- 1 tbs butter
- 1 small red onion (finely chopped) see note 1
- 250g (9 oz) mushrooms (finely chopped) see note 2
- 1 tsp minced garlic
- 1 tbs Worcestershire sauce
- 1 tsp salt
- 1 tsp black pepper
- 1 tsp paprika
- 1 tsp oregano
- 50g (1 cup) breadcrumbs
- 50g (1¾ oz) mozzarella (grated)
- 1 egg beaten
Caramelised Onion Mayonnaise:
- 1 tbsp olive oil
- 2 tbsp butter
- 2 large yellow onions
- 1 tbsp Worcestershire sauce
- mayonnaise
Additional Ingredients:
- salad accompaniments
- salsa (optional)
- mozzarella (optional)
Instructions
Caramelised Onion Mayonnaise:
- Add the olive oil and butter to a pan and heat together.
- Thickly slice the onions and add to the butter and oil.
- Let them cook for five minutes, then add the Worcester sauce.
- Continue to cool them on medium heat for around 20-30 minutes, stirring occasionally to make sure they aren't sticking. If they are cooking too quickly (starting to burn), turn the heat down.
- When ready, spoon into a bowl, and allow them to cool completely.
- When cooled, stir in as much mayonnaise as you like - I used around 250ml (1 cup)
Mushroom Meatballs:
- Add the olive oil and butter to a pan.
- When ready, add the chopped onions, and fry until soft.
- Add the mushrooms, garlic, Worcester sauce, seasoning and spices. Stir until combined and cook for around five minutes.
- Remove from the heat and allow to cool.
- When ready, beat an egg in a large bowl.
- Add the breadcrumbs and mushroom mixture, and give it a good stir to make sure it's well combined.
- Using your hands, roll into balls, and place on a dish lined with baking paper.
- Pop the mushroom meatballs in the freezer for 30 minutes to firm up.
- When ready, fry in a little oil, or cook in your Airfryer (which is what I did). Handle them carefully, as they can be a little fragile.
Assembly:
- Slice the subway buns in half.
- Apply a very thick spread of onion mayonnaise to one (or both) halves of the bread.
- Use any kind of salad you want, and add it to one half of the bread. Top with the meatballs, along with a sprinkling of mozzarella and salsa (if using). Enjoy!
Notes
I have converted grams to cups/ounces/tablespoons using online converters. Although I have no reason to believe they are inaccurate, please be aware that I have not made this recipe with imperial measurements.
- You can use either yellow/brown or red onions.
- I blitzed my mushrooms in a food processor as they feel more like "minced meat".
