Question: Can you please list all the characteristics of the product named sesame with the type code "Grade"?
SQL: SELECT t3.characteristic_name FROM products AS t1 JOIN product_characteristics AS t2 ON t1.product_id   =   t2.product_id JOIN CHARACTERISTICS AS t3 ON t2.characteristic_id   =   t3.characteristic_id WHERE t1.product_name   =   "sesame" AND t3.characteristic_type_code  =  "Grade"