"plain chocolate" meaning in English

{
  "forms": [
    {
      "form": "plain chocolates",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "plain chocolate (countable and uncountable, plural plain chocolates)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chocolate",
          "orig": "en:Chocolate",
          "parents": [
            "Sweets",
            "Foods",
            "Eating",
            "Food and drink",
            "Human behaviour",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "dark chocolate"
      ],
      "id": "en-plain_chocolate-en-noun-3ONOCUEJ",
      "links": [
        [
          "dark chocolate",
          "dark chocolate"
        ]
      ],
      "raw_glosses": [
        "(UK) dark chocolate"
      ],
      "tags": [
        "UK",
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "plain chocolate"
}

{
  "forms": [
    {
      "form": "plain chocolates",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "plain chocolate (countable and uncountable, plural plain chocolates)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Chocolate"
      ],
      "glosses": [
        "dark chocolate"
      ],
      "links": [
        [
          "dark chocolate",
          "dark chocolate"
        ]
      ],
      "raw_glosses": [
        "(UK) dark chocolate"
      ],
      "tags": [
        "UK",
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "plain chocolate"
}