Preheat the oven to 350°F (175°C). Line a 9x5 inch loaf pan with parchment paper or grease it lightly.
Beat the softened butter and sugar together in a large mixing bowl using an electric mixer or whisk until the mixture is light, fluffy, and pale in color, about 3-5 minutes. Visual cue: mixture should hold soft peaks and increase in volume.
Add eggs one at a time, beating well after each addition. Continue mixing until fully incorporated and the batter is smooth. Visual cue: batter should be glossy and homogeneous.
In a separate bowl, whisk together the sifted flour, baking powder, and salt. Gradually add dry ingredients to the wet mixture, mixing on low speed or folding with a spatula until just combined. Visual cue: batter should be thick but smooth, with no streaks of flour.
Gently fold in the lemon zest, chopped strawberries, and lemon juice into the batter with a spatula until evenly distributed. Visual cue: distribution should be uniform with visible specks of zest and fruit.
Pour the batter into the prepared loaf pan and smooth the top with a spatula. Bake for about 60 minutes, or until a toothpick inserted into the center comes out clean. Visual cue: golden-brown crust, edges slightly pulling away from the pan, and a moist but firm interior.
Remove the cake from the oven and let it cool in the pan for 15 minutes. Then, transfer to a wire rack to cool completely before slicing. Visual cue: a firm crust with a moist interior, just slightly pulling apart when sliced.