Portuguese spinach (Esparregado de Espinafre)

This one I learned to eat while living in Portugal. It goes really well with meat, but most of the time I'd just eat it by itself. In Portugal you can find esparregados frozen and ready to eat.
Enjoy!

Time of preparation: 20 min

1 bag of spinach
3 tbspoons of olive oil
2 cloves of garlic, chopped finely
salt
1/2 cup of milk
1 tspoon of flour


Cook the spinach in water, following the instructions (3 min in 3 tbspoons of water). Drain it and squeeze it well. Slice it or blend it.
In a frying pan, heat up the olive oil in medium heat and add the garlic. When the garlic begins to get golden, add the spinach and mix it well.
Mix the milk and the flour until the latter has dissolved. Add the mixture to the pan and lower the heat. Mix it well untill it gets thicker.