def METHOD_NAME(self, cell: NotebookNode) -> None:
    grade_id = cell.metadata.nbgrader['grade_id']
    try:
        solution_cell = self.gradebook.find_solution_cell(grade_id, self.notebook_id, self.assignment_id).to_dict()
        del solution_cell['name']
        del solution_cell['notebook']
        del solution_cell['assignment']
    except MissingEntry:
        solution_cell = {}
    self.new_solution_cells[grade_id] = solution_cell