Related Clues:

• Like grapefruit
• Like lemonade sans sugar
• Like some harrows
• Like psi
• Like sourballs
• Like crab apples
• Like lemonade
• Causing the lips to pucker
• Like unripe apples
• Sharp to the taste
• Jam-filled pastry
• Sharp in manner, biting
• The pastry sounds bitter
• Of taste, sharp or acid
• Sour like open cake