Here's a recipe I found that contains eggs and has no coffee in it...

Sourdough Chocolate Cake

• 2/3 cup shortening
• 1-2/3 cups white sugar
• 3 eggs
• 1-3/4 cups all-purpose flour
• 2/3 cup unsweetened cocoa powder
• 1 cup sourdough starter
• 3/4 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1 teaspoon salt
• 3/4 cup cold water
• 1 teaspoon vanilla extract 

1. Sift together flour, cocoa, soda, baking powder, and salt. 
2. Cream shortening, sugar, and eggs. Blend in sourdough starter.
3. Add sifted ingredients slowly to creamed mixture, beating until smooth.
4. Stir in water and vanilla, and mix well.
5. Pour batter into greased and floured 9 x 13 inch pan.  Bake at 350 degrees F (175 degrees C) for 35 minutes, or until done.    

Serves 18   

• Calories-223
• Fat-9.1g 
• Cholesterol-35mg
• Sodium-210mg 

From http://allrecipes.com   

Sourdough Starter (Donna German’s)   

• 2 cups lukewarm water or milk
• 2 cups bread or unbleached all-purpose flour
• 2-1/2 teaspoons yeast   

Mix together in a GLASS or PLASTIC BOWL the above ingredients. Do not use metal utensils. Cover the bowl with a tight fitting lid and allow to sit in a warm, draft-free location for 4 to 7 days, gently stirring once a day. You may use your starter after 4 days. To use your starter, simply remove the amount called for in the recipe and add to the other ingredients. Replace the amount removed with equal amounts of water/milk and bread/unbleached all purpose flour. I always used bread flour. After feeding your starter, leave on counter for 24 hours. At the end of that period you may refrigerate your starter. You must re-feed at least once every 7 days, so I use my starter once a week. If you do not plan to use it, then take one cup out and throw away and feed. If you will be away on vacation you may freeze your starter, thaw it in the refrigerator upon your return. As soon as it is thawed, remove at least one cup and feed as above. 

From http://www.geocities.com/NapaValley/8958/starter.htm

P.S. There is also a Sourdough Chocolate cake recipe found in many places that includes a chocolate glaze, but it seems very long and complicated so I din't include it.