Preheat your oven to 350°F and grease two 8-inch round cake pans. Line the bottoms with parchment paper so the cakes release perfectly. Set both pans aside—you'll need them ready to go the moment your batter's mixed. Don't skip this step or you'll rush when things get hectic.

Cream together the softened butter and granulated sugar for about 3 minutes until the mixture looks pale and fluffy. You'll know it's ready when you can't see any gritty sugar crystals anymore. Scrape down the bowl halfway through because some sugar always hides at the bottom.

Add your 4 room-temperature eggs one at a time, beating well after each addition. This takes patience—I know it's tempting to dump them all in at once, but trust me on this. After each egg, the mixture might look a bit broken or separated, but it smooths out once you keep mixing.

Pour in the vanilla bean paste and mix for 30 seconds, then alternate adding the flour mixture and milk. Start with flour (about 1/2 cup), then milk (1/3 cup), then repeat until you've used everything, ending with flour. Mix on low speed—don't overmix or your cake gets tough and dense.

Fold in the pureed strawberries and lemon juice by hand using a spatula until just combined. You want pink streaks throughout—don't overmix this part or the batter gets tough. The batter should be thick but pourable, and it'll smell absolutely amazing.

Divide the batter evenly between your prepared pans and bake for 33-35 minutes. The cakes are done when a toothpick inserted in the center comes out with just a few moist crumbs. Don't panic if they look slightly underbaked—they continue cooking a tiny bit as they cool.

Cool the cakes in their pans for 10 minutes, then turn them out onto wire racks to cool completely before frosting. This usually takes me about an hour—I know that's annoying, but warm cakes make your frosting slide right off. While you're waiting, prep your strawberry frosting by blending the pureed berries with powdered sugar and whipped cream.