This is one of my favourite things down here in the Yucatan and even though I’ve only made it in the food processor, I will tackle the mortar and pestle! There is also a great recipe for Picadillo Estilo Yucateco in this link, so check it out if you love the real deal when it comes to Mexican food.
yomimiyo 
Will roast them in the oven first, sounds yummy! How we doin’ sis??
Roasting the pepitas is a great idea! Ric is finally home after 6 weeks away so Iggy and I are muy feliz! Let’s Skype soon hermanita xo