Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE CHARACTERISTICS ( characteristic_name VARCHAR, characteristic_id VARCHAR, characteristic_type_code VARCHAR )
TABLE: CREATE TABLE products ( product_id VARCHAR, product_name VARCHAR )
TABLE: CREATE TABLE product_characteristics ( product_id VARCHAR, characteristic_id VARCHAR )

### Question ###
List all characteristics of product named 'sesame' with type code 'Grade'.

### Accurate 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"