Whisk the egg yolks, lemon juice, sugar, lemon zest and salt in a medium bowl and mix together well. Place over a pot of simmering water and whisk until the yolks are very thick, about 6 minutes. Cool.
Combine 1/4 cup whipping cream and the white chocolate in a mixing bowl over a pot of simmering water. Stir until melted and smooth. Cool to room temperature.
Beat the remaining 2 2/3 cup whipping cream until firm peaks form. Divide the whipped cream between the lemon and white chocolate mousse bases, folding in 1 cup at a time.
Layer the lemon mousse in 6 parfait glasses. Top with 2 tablespoons strawberries. Then layer the white chocolate mousse over the strawberries. Repeat the layering 2 more times.