Cook pork, in batches, in heated oiled wok or large pan until browned a all over.
Cover to keep warm.
Stir paste into same pan; cook, stirring, until fragrant.
Add corn and capsicum; stir-fry 2 minutes.
Add milk and juice; stir-fry 2 minutes.
Return pork to pan with spinach and basil; stir-fry until leaves are just wilted.