This is quite possibly the best way to eat asparagus. This is more commonly done in a frying pan and olive oil used. The reasons for the slight chances are for good reason. When asparagus cooks on a griddle it takes on a lovely nutty flavour and with the rapeseed being inherently nutty in flavour the pairing is perfect. Asparagus has for many years been considered a gourmet vegetable and in my eyes is more than worthy to be a dish in itself.
the simple ways are usually the best ways
As there are varying sizes of asparagus a quick test is to check the tips are tender with the point of a knife. You can also check if it is over done by taking the whole spear and trying to snap it at the base, if it does then it still will have a bit of bite.
Asparagus growing seasons in the UK are generally late April to late June. One of the highlights of spring and early summer!