Herculis

[spenser]

in french cookery mixture of onion carrots celery chopped in stews (8) _i_ _p_ i_  and

In biology, an involuntary response to a stimulus resulting in a change of orientation? (7)   _r_p_ _m

Thanks in anticipation

[hilary.denni]

mirepois

tropism :-)

[spenser]

Thanks so much.  Mirepois - I will never remember it!

[delilahcat]

It's usually spelt mirepoix

[spenser]

Ah! A twist!  Many thanks.