We found out all of this information with these clues.
1.The purchase that included parsnips cost 1 dollar more than the order that included Kale
2. Kathryn's purchase cost 1 dollar more that Alisha's purchase
3. Alisha's order cost less than the purchase that included onions
4. Leo's order included onions
5. Leo's purchase is either the $6.25 purchase or the $4.25 purchase.