Butter and flour four 8-oz ramekins. You can use nonstick spray, too.
Melt chocolate and butter in the microwave using 30-second intervals, stirring after each interval. Set aside.
In the mixing bowl, beat eggs and granulated sugar on high speed for 2-3 minutes. You can use an electric or hand mixer. A big whisk will work too.
Pour the warm chocolate mixture into the egg mixture.
Add a pinch of salt and vanilla extract. Fold with a spatula until combined.
Add sifted all-purpose flour. Mix until fully combined.
Divide batter between 4 prepared ramekins. Use an ice-cream spoon or a regular spoon.
Bake at 375°F (190°C) for 12-15 minutes, or until the outsides are firm and dry and the centers are soft.
After baking, let the cakes cool for about 1-2 minutes in the ramekins. Run a knife around the edge of the cakes to help them release. Carefully flip the freshly baked lava cakes upside down onto a plate. They should be released easily.
Top with fresh raspberries and pistachios. Serve immediately.
Notes
Get all ingredients ready before making this recipe.