Start with the finished food.
Write down the role the ingredient needs to perform. Flavour, colour, body and texture each need different trial criteria.
Compare the exact grade.
Ask for the composition, processing method, particle size and documentation for the grade being proposed. Keep those details with your sample records.
Make the result repeatable.
Record inclusion rate, mixing, heating and holding conditions. Change one variable at a time and assess the finished product against your objective.
Confirm the next step.
Share your trial results with the ingredient enquiry. Confirm quantity, specifications and supply terms before a commercial order.