"millionaire's salad" meaning in English

{
  "etymology_text": "So called because, once the palm hearts are harvested, the entire tree will die — making it a costly source of food.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "millionaire's salad",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
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          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Palm trees",
          "orig": "en:Palm trees",
          "parents": [
            "Commelinids",
            "Trees",
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A palm tree, Deckenia nobilis."
      ],
      "id": "en-millionaire's_salad-en-noun-kWyhEEo7",
      "links": [
        [
          "palm tree",
          "palm tree"
        ]
      ],
      "wikipedia": [
        "Deckenia nobilis"
      ]
    }
  ],
  "word": "millionaire's salad"
}

{
  "etymology_text": "So called because, once the palm hearts are harvested, the entire tree will die — making it a costly source of food.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "millionaire's salad",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms with non-redundant non-automated sortkeys",
        "Entries using missing taxonomic name (species)",
        "en:Palm trees"
      ],
      "glosses": [
        "A palm tree, Deckenia nobilis."
      ],
      "links": [
        [
          "palm tree",
          "palm tree"
        ]
      ],
      "wikipedia": [
        "Deckenia nobilis"
      ]
    }
  ],
  "word": "millionaire's salad"
}