1.Preheat oven to 180°C (160°C fan-forced). Grease deep 22cm-round cake pan; line base with baking paper.
2.Combine coffee and water in small bowl; stir until coffee dissolves. Cool 5 minutes.
3.To make walnut streusel; combine flour and sugar in medium bowl; rub in butter, using fingertips, until mixture resembles coarse breadcrumbs. Stir in the walnuts.
4.Beat butter, sugar and extract in medium bowl with electric mixer until light and fluffy. Beat in eggs, one at a time. Stir in sour cream and sifted flours and soda, in two batches. Stir in coffee mixture.
5.Spread mixture into pan; sprinkle walnut streusel over cake mixture, sprinkle walnuts over streusel.
6.Bake cake about 30 minutes. Stand cake in pan 5 minutes; turn, top-side up, onto wire rack to cool.
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