Possible Clues:

• Happy to eat onion, but not starter, fruit
• Tree bearing red fruit
• Sweet purple fruit
• Fruit tree
• Dark purple blackberry-like fruit
• Fruit: happy to consume the third of four pounds!
• Drunk to devour onion where starter denied in fruit
• Tree whose leaves are eaten by silkworms
• Tree favoured by silkworms
• Fruit which when drunk could make me blurry