- STEP 1
Heat some oil in a fry pan on medium-high heat. Chop the red onion and capsicum in a food processor until it is finely diced. Add the onion and capsicum to the fry pan and cook for approx 3-4 minutes until they start to brown.
- STEP 2
Add salt and tomato paste to the pan and cook for 1 minute. Add tomatoes, beef stock, soy sauce and sugar. Bring to a simmer and then reduce heat to low. Stir occasionally until sauce has thickened, approx 10-12 minutes.
- STEP 3
Grate and then finely chop the courgette in the food processor. Or, if using spinach, wash thoroughly then finely chop in the food processor. When sauce has 1-2 minutes remaining, add the courgette or spinach and stir to combine.