It was a phone call, and another interview to see what they thought. It mostly consisted of seeing how you would react in certain situations. This is not something to prepare much for in the sense that you never know what the questions they ask will be.
Engineering Intern applicants have rated the interview process at Oishii Farm with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 50% positive. This is according to Glassdoor user ratings.
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