Heat a skillet and add a little olive oil. Sweat onions with a pinch of salt until translucent. Set aside to cool.Meanwhile, combine 1/4 cup evaporated milk with breadcrumbs. Stir to combine and set aside for several minutes. To the breadcrumb mixture, stir in onions, yolk, salt, allspice and pepper. Add meat and mix until just combined. Shape meat mixture into 1-in. balls. In large skillet, melt butter and cook meatballs. Remove from skillet (you may want to keep in a warmed oven).
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