Creating child elements to existing Parent elements

Hi all,
I was not able to find out how to create child elements to existing
Parent elements after going through my XSLT document and searching on
the web. I might not be searching with the right key words. Here is my
problem:

My Source xml document looks something like this:
<Spices>
     <Spice name="black pepper" id="11"/>
     <Spice name="ginger powder" id="12"/>
      <Spice name="salt" id="13"/>
</Spices>
....
<MeatsParentTags>
......
    <Meats>
         <Meat name="pork" id="21"/>
    </Meats>
</MeatParentTags>
.....
<Vegetables>
        <Vegetable name="Green Pepper" id="34/>
</Vegetables>

My desired output would be a combination of these tags.
<Ingredients>
       <Ingredient name="black pepper" id="11"/>
       <Ingredient name="ginger powder" id="12"/>
      <Ingredient name="salt" id="13"/>
       <Ingredient  name="pork" id="21"/>
        <Ingredient name="Green Pepper" id="34/>
</Ingredients>

My XSLT would create element <Ingredients> when processing <Spices>.
Later on it should only create <ingredient> element as child element
to <Ingredients> element when processing <Meat> or <Vegetable>. Any
suggestion on how this can be achieved?