I have a fairly good knowledge of Greek cuisine, but the name "Spearheart" doesn't sound like anything I've come across before. However, I think that you may be refering to a type of Greek pie called Spanakotyropita or more commonly)spanakopita. The reason I believe thi may be what your looking for is both the simularities in name and also the type of pie or "pizza" that can be made. Although there are many different recipies, many variations call for ground lamb as one of the main ingredients.
Check out this recipe and see if it is what you're thinking of:
http://www.foodnetwork.com/food/recipes/recipe/0,,FOOD_9936_16123,00.html
There is also a Greek dish called Bourekakia which is a meat (lamb) in pyllo dough. This could be made very much like a small pizza. Here is a link to a recipe for bourekakia:
http://www.eatgreektonight.com/recipe.cfm?TypeID=4&RecipeID=70
There may be a few other recipes that I haven't thought of. Let me know if either of these seems like what you remember. Thanks,
-Pete
