If you don’t have apricot jam, replace it with an additional 1/4 cup (50g) of sugar. You can also use
orange marmalade in place of the apricot jam, whizzing it in a mini-food processor until smooth. (If your apricot jam isn’t smooth, that’ll smooth it out, too.) If you want to keep them extra-simple, you can also skip rolling them in sliced almonds and simply bake them nudi (see picture, below.) They’re excellent like that way as well.
As mentioned, I used pine nuts for some of the cookies, which you’re welcome to use as well in place of the sliced almonds. Traditional Sicilian cookies often have bitter almonds added, which are very hard to find. (Amaretti di Saronno use
apricot kernels.) Most almond extract is made from bitter almonds, so I often add a bit to desserts that use almonds, to highlight their flavor. But do go easy on the almond extract; it’s a flavor that can quickly become overpowering. A few drops should do it.