01 -
Preheat the oven to 175°C (350°F). Grease a 13x25cm (5x10 inch) loaf pan with butter and line with parchment paper, allowing at least 5cm overhang on long sides.
02 -
In a mixing bowl, combine brown sugar and salt. Pour in melted butter and mix with a fork. Add flour and mix until just combined to form a thick, crumbly texture. Refrigerate while preparing batter.
03 -
In a separate bowl, whisk together flour, baking soda, baking powder, and salt until evenly combined.
04 -
In the bowl of a stand mixer fitted with a paddle attachment, cream butter and sugar until light and fluffy, about 3 minutes. Mix in vanilla extract. Add egg and mix until fully incorporated, scraping bowl as needed. Mix in sour cream and orange juice until smooth.
05 -
Add dry ingredients to wet mixture and mix on low speed until just incorporated. Using a rubber spatula, gently fold in diced strawberries.
06 -
Spread half the batter into the prepared pan. Dollop half the strawberry jam on top and swirl into batter with a knife. Sprinkle half the streusel over jam layer. Spread remaining batter over streusel, then repeat with remaining jam and streusel on top.
07 -
Bake on middle rack, uncovered, for 45 minutes. Cover with aluminum foil and continue baking for 25-30 minutes longer, until a tester inserted in center comes out clean.
08 -
Remove from oven and cool in pan for 30 minutes. Use parchment overhang to gently lift cake out of pan onto a cooling rack. Allow to cool for another 30 minutes before slicing.
09 -
Using a serrated knife, cut into thick slices. Serve warm with a spread of softened salted butter if desired.