Theory:

The poem is about a small girl named Sarah. She was standing near the bed where her grandmother was lying. She asked her grandmother what she wanted for her breakfast. Sarah's grandmother said she wanted a Johnnycake. It is made with flour, sugar, butter, and water. Grandmother wanted Sarah to make the cake quickly for her. She told Sarah to mix all the ingredients in one minute and to bake it for two minutes, and the Johnnycake would be ready.
 
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Little Sarah went to the closet where all the kitchen ingredients are kept and checked for the flour. But the tin in which they used to keep the meal, was empty as if some wind had come and swept it away. She could not find even a bit, but she wanted to bake the Johnnycake for the grandmother at any cost in one minute mix and two minutes bake it.

She ran to the shop, but the shopkeeper said that he does not have and asks the fair and bright coloured girl to go to the miller who can help her out. A miller will have a mill, and he would grind the corn within a minute. The shopkeeper asks her to run to the miller to get the flour.
 
Sarah ran to the miller immediately, but even the miller said that he does not have any corn. Then the miller suggests her to go tothe cornfield above the hill to find some corn in the field so that she can bring it back to the mill and the miller will grind it for her. He asks her to run and get it, otherwise how will she mix the flour in a minute and bake the cake in two minutes.
 
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Sarah ran to the cornfield, but there was no corn grown at all, though the sun was bright and the weather was good. She cried and requested the sun to make the corn grow, but the sun says that he cannot do so.
 
Sarah tells the sun that unless he grows the corn, she cannot make Johnnycake. Then Sarah looked around the field and saw that corn was not planted at all, then how will the corn grow.
 
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She goes to the farmer and asks him to sow grains of corn for her, but the farmer laughed continuously till his cheeks hurt and said though he can sow the grain of corn, it will take some time to grow, then how is that Sarah is going to mix the flour in one minute and bake the cake in two minutes. The farmer continued laughing louder and louder and asked how he could sow any plant till the soil is ploughed. He asks Sarah to run to the ploughman and bring him as quickly as possible so that he can plough the field and the farmer can sow the seeds of corn.

Sarah was still positive that she would bake the cake, so she ran to the ploughman. The ploughman ploughed the field, and the farmer sowed the seeds of corn. The sun shed its rays, and the corn was grown.

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She took the corns to the miller, and he made the flour. Sarah took the flour ran back to her home and baked the cake and gave it to her grandmother. Grandmother had it and asked for one more. She told Sarah again to mix it in one minute and bake it in two minutes.