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1
Tear the bread and submerge it in the sherry vinegar. Allow it to soak until fully saturated and soft throughout — the bread must be limp, not merely damp, before it enters the blender; dry fragments will resist emulsification and produce lumps.
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2
Place the tomatoes, garlic, cucumber, green pepper, and the soaked bread with its vinegar into the blender. Blend at high speed to a coarse purée, then, with the motor running, pour the olive oil in a slow, steady stream. This is where the dish lives or dies: a rushed pour breaks the emulsion and leaves an oily, separated surface; the finished blend must be uniformly smooth, with no visible oil pooling.
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3
Pass the entire contents through a fine-mesh sieve, pressing firmly with a ladle to extract all liquid. Discard the dry solids of skins and seeds retained in the sieve. The strained soup should run clean and glossy, with no visible fragments.
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4
Season with fine sea salt. Taste and adjust the sherry vinegar. Refrigerate for a minimum of four hours. The soup is ready when it is chilled to 4–6°C and the flavours have married into a single, coherent profile — the sharpness of the vinegar no longer standing apart from the oil.
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5
Serve in chilled bowls. Arrange the diced tomato, cucumber, red onion, and croutons on the surface. The soup should arrive at the table ice-cold; any warmth collapses both the emulsion body and the aromatic freshness.