1 - In a large bowl, mix the sugar and shortening thoroughly, using a wooden spoon or an electric mixer . Gradually add the remaining ingredients. Continue beating and add flour gradually until the mixture is stiff, but not too dry. Form the dough into a roll about 2 inches in diameter, wrap in plastic wrap, and chill for 1 hour.
2 - Preheat the oven to 350 F. With a sharp knife, cut the dough into 1/4-inch slices and place them on a nonstick or a lightly buttered regular cookie sheet.  Cut pieces of guava paste into dime-sized circles or squares, making each approx 1/4 inch thick. Lightly press one piece into the top of each cookie and bake until lightly browned, 20 to 25 minutes. Store in a tightly covered tin. The cookies will keep for one week.

Ingredients:

1 cup sugar
4 cups all-purpose flour
1 bar guava paste
1 cup vegetable shortening
1 1/2 tsp. grated lime peel
1 tsp. salt
1 tsp. baking powder