Key limes also have more seeds than Persian limes, a fact important to keep in mind especially when cooking with the fruit. Perhaps the biggest difference between the two fruits is in their taste.

Add condensed milk and whisk a few more minutes more. Add passion fruit purée, lime zest, juice and combine. Pour the filling into the cooled pie crust. Bake until the filling sets but still ...

According to US Citrus, there are more than 20 different varieties of limes, ranging from tart key limes to floral Kaffir ... which can encourage the fruit to release more juice when squeezed.