Harvest Moon: Friends of Mineral Town Tips

The Low-down on Mayonnaise
There are two ways to create Mayonnaise in this game. The first way is to "cook" it in your kitchen:

Mayonnaise (Small): Regular Quality Egg + Oil + Whisk + Vinegar
Mayonnaise (Medium): Good Quality Egg + Oil + Whisk + Vinegar
Mayonnaise (Large): High Quality Egg + Oil + Whisk + Vinegar
Mayonnaise (Golden): Golden Egg + Oil + Whisk + Vinegar
Mayonnaise (P): P Egg+ Oil + Whisk + Vinegar
Mayonnaise (X): X Egg + Oil + Whisk + Vinegar or Mayo (S) + Mayo (M) + Mayo (L) + Mayo (G)+ Mayo (P)

The second way is to buy a Mayonnaise Maker from Saibara. You won't be able to get it until you've expanded your Chicken Coop. Once that is done you need to bring a piece of Adamantite Ore and 20,000 G to Saibara. It will take him 5 days to build it, but you won't have to pick it up because Gray will automatically install it in your Chicken Coop when it is done. To use the maker just face it while holding an egg and press the "A" button.

Mayonnaise sells for as follows:

100G Mayonnaise (S): Gained from a Regular Quality Egg
150G Mayonnaise (M): Gained from a Good Quality Egg
200G Mayonnaise (L): Gained from a High Quality Egg
300G Mayonnaise (G): Gained from a Golden Egg
450G Mayonnaise (P): Gained from a P Egg
800G Mayonnasie (X): Gained from an X Egg