Ingredients (to 4 people):

2  14.5 oz jars of of sliced Hearts of Palm 
Tomato sauce as required
50 grams of grated gruyère cheese
25 grams of grated parmesan cheese
2 tablespoons of cream

Preparation:
Drain the Hearts of Palm. Mix the tomato sauce with the cream and warm them in a low heat for 5 minutes. Put the Hearts of Palm in an oven pan, covering them with the sauce, then sprinkle the two types of cheese. Take the pan to the oven for a few minutes.