Baked mushrooms

Tea tonight was inspired by Nigel Slater's fast supper recipie in The Observer.

Field mushrooms (England)
Onions (England)
Garlic
Breadcrumbs (UK)
Cheddar (UK)
Pine nuts ('Product of more than one country, packed in the UK')
Salad leaves ('Product of various countries, packed in the UK')
Tomatoes (Spain)
Pears (UK)
Sweetcorn (Israel)