Add the olive oil into a large bowl, along with the sherry vinegar and grated garlic, then season with salt & pepper and whisk together

Roughly dice the tomatoes (making sure to dice each tomato in the exact same size), finely chop the cucumber, finely chop the spring onion, and finely chop the green bell pepper (making sure to finely chop all three vegetables in the exact same size)

Add the chopped vegetables into the bowl with the dressing, season with salt & pepper, and gently mix together until well mixed

Serve at room temperature or chilled, it will hold for up to 3 to 4 days in the fridge, enjoy!