Vegan Mayonnaise

I love Veganaise. It's just as satisfying as real mayo but it's too expensive so here's an alternative. I'm still trying to make it more like veganaise but it's close enough to pass.
1 block Silken tofu
2 tbsp olive oil
5 tsp agave syrup
3 tsp apple cider vinegar
1 tsp lemon juice
2 tsp ground mustard
1 tsp sea salt
2 tbsp cornstarch

All ingredients in a food processor. Blend until smooth. Cook over medium heat in a small saucepan for about 7 minutes or until it's thick. (It will thicken more when it's cooling too.) Stir constantly with a rubber spatula. Take it off the stove and continue stirring occasionally while it cools.
Keep in a glass jar in the fridge.