Beat eggs and egg yolks in medium-sized bowl. Add 1 1/2 cups sugar and whisk together.
Add heavy cream and half and half to a large saucepan and heat gently; do not let come to a boil.
Temper eggs by slowly pour 1 cup of hot heavy cream mixture into egg mixture while whisking quickly. This will raise the temperature of the eggs carefully without scrambling them. Then while stirring, pour the tempered egg mixture slowly into the remaining heavy cream mixture in the saucepan.
Gently heat ice cream base over medium low heat, stirring constantly (especially the corners of the pot), until thickened and reaches 170F on a digital thermometer. The mixture should look silky and coat the back of a spoon so when you run your finger through it, it doesn’t come back together.
Remove from heat and add vanilla. Strain through a fine-mesh sieve (to catch any cooked egg pieces) and chill in an ice bath (a bowl set inside of a bowl of ice water) until it’s cooled to room temperature. Then cover with plastic wrap and move into the refrigerator until completely cold, about 2-3 hours.
While mixture cools, add 1 cup of blueberries to small saucepan and cover with 1/4 cup sugar and 1/4 cup water. In a separate small saucepan, add 1 cup of strawberries and 1/4 cup water and 1/4 cup sugar.
Heat both pans over medium heat and allow berry mixtures to cook until berries begin to breakdown and syrup develops and thickens. Turn off heat and cool to room temperature and store until ice cream is ready for churning.
When custard is completely chilled, add to ice cream maker following the manufacturer's instructions and freeze.
To create ripples, alternate scoops of ice cream into a freezer safe container with berry syrups and take knife to swirl through ice cream. Store in freezer.