Pan Seared Salmon with Avocado Tomato Salsa

skinless salmon filets ((each fillet should weigh about 5 ounces or 140 g))

Salt and pepper (to season)

lemon juice (divided)

olive oil

unsalted butter

large cloves garlic (finely chopped or minced)

tomatoes, (finely chopped)

red onion, (finely chopped )

fresh cilantro leaves, (finely chopped)

Serrano chile ((or jalapeño), stems, ribs, seeds removed and finely chopped -- adjust to your heat preference)

small clove garlic, (crushed)

lime juice

salt

large avocado, (sliced)