Greek
Heat the oven to 170C and brush a 20 x 20 cm baking pan with melted butter.
Mix the walnuts, pistachios and cinnamon; cut or fold the phyllo sheets to fit the pan and keep them covered with a damp towel.
Layer 8 sheets in the pan, brushing each with butter, then scatter half the nuts, add 4 more buttered sheets and the rest of the nuts, and finish with 8 buttered sheets.
Cut into 16 diamonds or squares all the way through, then bake for 45-50 minutes until deep golden and crisp.
Meanwhile, simmer the sugar, water, honey and lemon juice for 10 minutes until slightly thickened, then let the syrup cool.
Pour the cool syrup slowly over the hot baklava as soon as it comes out of the oven.
Leave it uncovered at room temperature overnight to absorb the syrup, and serve 2 pieces per person.