Bloom the gelatin: In a small microwavable container, add 3 tablespoon water and sprinkle the gelatin powder over it. Let it sit for a few minutes to bloom.
Prepare the strawberry sauce: Wash the strawberries and pat dry. Remove the hulls and cut into ¼-inch pieces. Transfer to a microwavable container, then add 2 tablespoon sugar and 1 tablespoon lemon juice. Mix well and set aside.
Heat the panna cotta base: In a pot, combine the milk, heavy cream, and 4½ tablespoon sugar. Warm over low heat until it reaches about 125°F (52°C). Do not boil. Remove from heat once warmed.
Melt and add gelatin: Microwave the bloomed gelatin for 20–30 seconds until fully melted (do not boil). Add it to the warm cream mixture and stir well until fully combined.
Cool and chill the panna cotta: Place the pot in an ice bath and let it cool for about 10–15 minutes, stirring occasionally. Then pour the mixture into dessert cups and refrigerate for 2–3 hours, or until fully set.
Cook the strawberry sauce: Cover the strawberry mixture with plastic wrap and microwave for about 1 minute (1200W). Let it cool, then refrigerate until chilled.
Assemble and serve: Once the panna cotta is set, spoon 1–2 scoops of strawberry sauce on top. Serve and enjoy.