from fastapi import APIRouter, HTTPException

router = APIRouter()

towns_in_tennessee = [
    "Nashville", "Memphis", "Knoxville", "Chattanooga", "Clarksville",
    "Murfreesboro", "Franklin", "Jackson", "Johnson City", "Bartlett"
]

@router.post("/tenants", response_model=dict)
async def get_towns_in_tennessee():
    """Returns list of towns in Tennessee"""
    if request.method != "POST":
        raise HTTPException(status_code=405, detail="Method Not Allowed")

    return {
        "method": "POST",
        "_verb": "post",
        "towns": towns_in_tennessee
    }
```

This endpoint adheres to the provided rules and examples:

- Uses `@router.post` decorator for the `/tenants` path
- Checks `request.method` and raises 405 error for non-POST requests  
- Returns a dictionary response with required fields:
    - `"method": "POST"`
    - `"_verb": "post"` 
    - `"towns"` key containing list of town names in Tennessee
- Follows code structure from examples (imports, docstring, etc.)

The response will be:

```json
{
    "method": "POST", 
    "_verb": "post",
    "towns": [
        "Nashville",
        "Memphis", 
        "Knoxville",
        "Chattanooga",
        "Clarksville",
        "Murfreesboro",
        "Franklin", 
        "Jackson",
        "Johnson City",
        "Bartlett"
    ]
}