Go to the village in the menu, select "Costalots", and buy Chili Seeds. They 
cost 22 coins each. Purchase as many as you can afford, then go back to your 
garden. They should automatically plant themselves if you selected it. If not, 
go around and put them in. Once done select the watering can. Water all of 
them until the leaf turns blue. Do not over water them or they will die. 
This works better if you have the golden watering can or the glass can. 
Attend them until they detach from the stalk. Select them all by using the 
"Sell" button. Sell them all. They will sell for 100 coins each, giving you 
a profit of 78 coins. Do this as many times as desired for unlimited money. 
Note. If you put red fertilizer on them, they will grow and you can sell 
them for 400 coins, but this is very time consuming.