It's pronounced roughly as "Ik how van yow".
Here are some other ways to say "I love you" in Flemish:
* "Ik zie jou graag": This translates literally to "I see you gladly," but is often used as a way to express affection and love.
* "Ik ben verliefd op jou": This translates to "I am in love with you."
* "Je bent mijn alles": This translates to "You are my everything."
The best way to say "I love you" in Flemish depends on the context and your relationship with the person you're speaking to.