请用JSON格式告诉我如何制作一个简单的三明治，并包含所有食材和制作步骤，每个步骤后添加一句话总结。
user
{
  "sandwich_recipe": {
    "ingredients": [
      "2 slices of bread",
      "2 slices of cheese",
      "2 slices of ham",
      "1 tablespoon of mayonnaise",
      "1 lettuce leaf",
      "1 tomato slice"
    ],
    "steps": [
      {
        "step": 1,
        "description": "Spread mayonnaise on one side of each bread slice.",
        "summary": "Greasing the bread with mayonnaise ensures a moist and tasty sandwich."
      },
      {
        "step": 2,
        "description": "Place a slice of cheese on the mayonnaise of one bread slice.",
        "summary": "Adding cheese provides a creamy and savory element."
      },
      {
        "step": 3,
        "description": "Add a slice of ham on top of the cheese.",
        "summary": "The ham adds a delicious meaty flavor."
      },
      {
        "step": 4,
        "description": "Place the lettuce leaf and tomato slice on top of the ham.",
        "summary": "Vegetables add freshness and crunch."
      },
      {
        "step": 5,
        "description": "Top with the other slice of bread, mayonnaise side down.",
        "summary": "Closing the sandwich completes the assembly."
      },
      {
        "step": 6,
        "description": "Cut the sandwich in half if desired.",
        "summary": "Diving the sandwich makes it easier to enjoy."
      }
    ]
  }
}
assistant