Try to avoid repeating fields for this task. They are very handy at the very beginning but the data filled in is sort of lost later and inaccessible by relationships. This is due to the fact that historicly repeating fields are from the FileMaker stoneage and predating relationships.
Use an extra table for the ingredients, connect them via relationship and export from excel will be without problem.
Aside: FileMaker ships example files which use repeating fields the same wrong way which is a pity and very misleading for newbees.
FileMaker separates values in a repeating field with an ASCII-29 character. Therefore, if you need to bring the information into a repeating field, separate each entry with an ASCII-29. By using a carriage return (ASCII-13), the data will be brought into separate records.
I don't know Excel well enough to know if this is possible.
Suggestions from others?