Slice your avocados in half lengthwise. Remove the pits and scoop them into a bowl. Add the lemon juice and a good pinch of sea salt, and mash with a fork until relatively smooth. Briefly set aside.
Pre-heat your broiler on high, and slice your bread into pieces roughly ¾-inch thick. Arrange the bread on a baking sheet and broil for 1-2 minutes per side until nice and toasty. (Yes, you can obviously use a toaster if you prefer.)
Spread each piece of toast with a thick layer of avocado mash. Top with lobster, then sprinkle with jalapeño and chives. Drizzle each with a teensy bit of olive oil.