So teeeeechnically, a salad is a dish composed of mixed ingredients. You could make the argument that you mix any two set of chopped ingredients and bingo bongo, it's a salad.
However, I like to think that dishes' ingredients aren't a taxonomic thing, they're a probabilistic thing. In other words, there's no such thing as "not salad" or "salad", only shades of saladness.
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Serve it cold? Ok it's saladier
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It's made up of chopped ingredients? Saladier still
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Those ingredients are mostly vegetables? Getting pretty saladish
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They're mixed together? Even more salad like
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They've got some sort of dressing mixed in? Now it's very likely a salad!
... and so on. To me, your SO'a dish has a pretty high Salad Probability^tm