Read the following context and choose the best option to answer the question.
Context: Add the onions and some salt sweat until sweet and translucent . Add the peas and defrost in the skillet with the onions . When the peas are fully warmed , turn off the heat of the skillet . Add the yogurt , tarragon and pistachios .
Question: Why are the onions added first ?
Options: 
- The onions need to be cooked longer .
 - The onions have too much salt
 - None of the above choices .
 - The onions are added after the yogurt .


The onions need to be cooked longer .