In a large bowl, cream shortening and sugar until light and fluffy. Mash bananas–Beat in eggs, bananas, and water.
Sift together flour, baking powder, soda, salt, cinnamon, and cloves.
Add to banana mixture and mix well.
Add nuts and stir them in with spoon.
Insert canning funnel into mouth of jar and pour mixture into greased jars, filling half full. Do NOT put lids on jars for baking. Be careful to keep the rims clean, wiping off any batter that gets on the rims.
Place jars directly on rack in oven. Bake for 45 minutes. Don’t worry if a few rise over the top of the jar a bit. You can press it down with the lid after it has finished baking.
While jars are still warm, add lids. Screw on tightly.
Listen for the ping once you have added the lids; this means that the jar is sealed. If you miss the “ping”, wait until they are completely cool and press on the top of the lid. If it doesn’t move at all, it’s sealed.