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The accurate method for sinking to BigQuery by utilizing Dataflow Apache Beam involves the following steps:

1. Create a pipeline that reads data from the source (e.g., CSV, JSON, or Avro files), transforms it as necessary, and writes it to BigQuery.

2. Use the Apache Beam SDK to define your pipeline. You can use any of the supported languages, including Java, Python, or Go.

3. Add the necessary dependencies to your project, including the Apache Beam SDK and the BigQuery connector.

4. Write the source data to an input data source, such as a Cloud Storage bucket or a Pub/Sub topic.

5. Use transforms to process the data as necessary. This may include data cleaning or aggregating.

6. Define a BigQueryIO.Write transform to write the processed data to a BigQuery table.

7. Specify the BigQuery table schema and format, as well as any other options, such as the write disposition or create disposition.

8. Run the pipeline using the Dataflow runner, which will execute the pipeline and write the data to BigQuery.