Put the tomatoes and garlic into a bowl. Stack 6 basil leaves together, roll into a cigar shape and slice into thin strips. Repeat with the remaining basil leaves. Mix the basil and thyme into the tomatoes. Stir in enough oil to make a relish texture.

Make the avocado butter:

Slice the avocado in half lenghtwise and remove the stone. Peel the avocado, then chop the flesh and put in a food processor. Add the lime juice, Tabasco sauce to taste and season with salt and pepper. Process until smooth.

Cut each foccacia in half widthways. Spread a layer of avocado butter on the halves, top with tomato relish and cover with the remaining halves.