"Embden groats" meaning in English

{
  "etymology_text": "Emden (previously Embden), in the extreme north-west of modern Germany, was an important port for the export of goods to England, including oats. However, the connection to Embden groats is not clear.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "Embden groats pl (plural only)",
      "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 pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Crushed or cracked groats (hulled oats) for making gruel."
      ],
      "id": "en-Embden_groats-en-noun-oNB4lQap",
      "links": [
        [
          "Crushed",
          "crushed"
        ],
        [
          "cracked",
          "cracked"
        ],
        [
          "groats",
          "groats"
        ],
        [
          "hulled",
          "hulled#English"
        ],
        [
          "oats",
          "oats#English"
        ],
        [
          "gruel",
          "gruel"
        ]
      ],
      "raw_glosses": [
        "(historical) Crushed or cracked groats (hulled oats) for making gruel."
      ],
      "tags": [
        "historical",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "Embden groats"
}

{
  "etymology_text": "Emden (previously Embden), in the extreme north-west of modern Germany, was an important port for the export of goods to England, including oats. However, the connection to Embden groats is not clear.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "Embden groats pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with historical senses"
      ],
      "glosses": [
        "Crushed or cracked groats (hulled oats) for making gruel."
      ],
      "links": [
        [
          "Crushed",
          "crushed"
        ],
        [
          "cracked",
          "cracked"
        ],
        [
          "groats",
          "groats"
        ],
        [
          "hulled",
          "hulled#English"
        ],
        [
          "oats",
          "oats#English"
        ],
        [
          "gruel",
          "gruel"
        ]
      ],
      "raw_glosses": [
        "(historical) Crushed or cracked groats (hulled oats) for making gruel."
      ],
      "tags": [
        "historical",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "Embden groats"
}